Losartan
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Losartan API Reference standards and its EP Impurities, USP Impurities, non pharmacopeial Impurities, listed below & also offered custom synthesis for unknown Impurities. If require any contact info@drjcrbio.com, sales@drjcrbio.com
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Product Name : Losartan related compound B (according to vendor) ; Losartan RC 1; 4′-[[2-Butyl-4-chloro-5-(hydroxymethyl)-1H-imidazol-1-yl]methyl]-[1,1′-biphenyl]-2-carbonitrile| 114772-55-3
Code: JCLOS-35 CAS: 114772-55-3 Chemical Formula:C22H22ClN3O Molecular Weight:379.88 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan related compound B (according to vendor) ; Losartan RC 1; 4'-[[2-Butyl-4-chloro-5-(hydroxymethyl)-1H-imidazol-1-yl]methyl]-[1,1'-biphenyl]-2-carbonitrile| 114772-55-3 is useful as reference Impurity standard. -
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Product Name : Losartan related compound A (according to vendor) ; Losartan RC 2; 4′-[(2-Butyl-4-chloro-5-formyl-1H-imidazol-1-yl)methyl]-[1,1′-Biphenyl]-2-carbonitrile |124750-67-0
Code: JCLOS-34 CAS: 124750-67-0 Chemical Formula:C22H20ClN3O Molecular Weight:377.87 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan related compound A (according to vendor) ; Losartan RC 2; 4'-[(2-Butyl-4-chloro-5-formyl-1H-imidazol-1-yl)methyl]-[1,1'-Biphenyl]-2-carbonitrile |124750-67-0is useful as reference Impurity standard. -
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Product Name : Losartan Impurity ;5-(4′-(Dibromomethyl)-[1,1′-biphenyl]-2-yl)-1-trityl-1H-tetrazole |358685-13-9
Code: JCLOS-33 CAS: 358685-13-9 Chemical Formula: C33H24Br2N4 Molecular Weight: 636.38 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity ;5-(4'-(Dibromomethyl)-[1,1'-biphenyl]-2-yl)-1-trityl-1H-tetrazole |358685-13-9 is useful as reference Impurity standard. -
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Product Name : 5-(4′-(Bromomethyl)-[1,1′-biphenyl]-2-yl)-2H-tetrazole ;5-(4′-(Bromomethyl)-[1,1′-biphenyl]-2-yl)-1H-tetrazole |138402-33-2
Code: JCLOS-32 CAS: 138402-33-2 Chemical Formula: C14H11BrN4 Molecular Weight: 315.17 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 5-(4'-(Bromomethyl)-[1,1'-biphenyl]-2-yl)-2H-tetrazole ;5-(4'-(Bromomethyl)-[1,1'-biphenyl]-2-yl)-1H-tetrazole |138402-33-2 is useful as reference Impurity standard. -
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Product Name : 4′-((5-(azidomethyl )-2 butyl -4 chloro- 1H – imidazole – 1yl)-[1,1 biphenyl]-2-carboxiamide
Code: JCLOS-31 CAS: NA Chemical Formula: C22H33CIN6O Molecular Weight: 422.16 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 4'-((5-(azidomethyl )-2 butyl -4 chloro- 1H - imidazole - 1yl)-[1,1 biphenyl]-2-carboxiamide is useful as reference Impurity standard. -
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Product Name : 4′-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1′-biphenyl]-2-carboxylic acid
Code: JCLOS-30 CAS: NA Chemical Formula: C22H22CIN5O2 Molecular Weight: 423.9 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 4'-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1'-biphenyl]-2-carboxylic acid is useful as reference Impurity standard. -
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Product Name : 4′-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1′-biphenyl]-2-carbonitrile
Code: JCLOS-29 CAS:2755908-48-4 Chemical Formula: C22H21ClN6 Molecular Weight: 404.90 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 4'-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1'-biphenyl]-2-carbonitrile is useful as reference Impurity standard. -
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Product Name : Losartan potassium working standard ;2-Butyl-4-chloro-1-{[2′-(1H-tetrazol-5-yl)(1,1′-biphenyl)-4-yl]methyl}-1H-imidazole-5-methanol monopotassium salt, Losartan potassium |124750-99-8
Code: JCLOS-28 CAS: 124750-99-8 Chemical Formula: C22H22ClKN6O Molecular Weight: 461.01 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan potassium working standard ;2-Butyl-4-chloro-1-{[2′-(1H-tetrazol-5-yl)(1,1′-biphenyl)-4-yl]methyl}-1H-imidazole-5-methanol monopotassium salt, Losartan potassium |124750-99-8 is useful as reference Impurity standard. -
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Product Name : 4-(azidomethyl)-2-butyl-5-chloro-1H-imidazole ; 4-(azidomethyl)-2-butyl-5-chloro-1H-imidazole |2353190-33-5
Code: JCLOS-25 CAS: 2353190-33-5 Chemical Formula: C8H12ClN5 Molecular Weight: 213.67 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 4-(azidomethyl)-2-butyl-5-chloro-1H-imidazole ; 4-(azidomethyl)-2-butyl-5-chloro-1H-imidazole;2353190-33-5 is useful as reference Impurity standard. -
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Product Name : Losartan trityl azide Impurity; 5-(4′-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1′-biphenyl]-2-yl)-1-trityl-1H-tetrazole
Code: JCLOS-26 CAS: Chemical Formula: C41H36ClN9 Molecular Weight: 690.25 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan trityl azide Impurity; 5-(4'-((5-(azidomethyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1'-biphenyl]-2-yl)-1-trityl-1H-tetrazole is useful as reference Impurity standard. -
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Product Name : 2-Cyano-4′-methylbiphenyl ;4′-Methyl-[1,1′-biphenyl]-2-carbonitrile | 114772-53-1
Code: JCLOS-27 CAS: 114772-53-1 Chemical Formula: C14H11N Molecular Weight: 193.24 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: 2-Cyano-4'-methylbiphenyl ;4'-Methyl-[1,1'-biphenyl]-2-carbonitrile | 114772-53-1 is useful as reference Impurity standard. -
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Product Name : Losartan Azide impurity; Losartan Azide impurity; 2-butyl-4-chloro-5-(azidomethyl)-1-[(2′-(1H-tetrazol-5-yl)biphenyl-4yl)methyl]-1H-imidazole
Code: JCLOS-24 CAS: 727718-93-6 Chemical Formula: C22H22ClN9 Molecular Weight: 447.93 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Azide impurity; Losartan Azide impurity; 2-butyl-4-chloro-5-(azidomethyl)-1-[(2'-(1H-tetrazol-5-yl)biphenyl-4yl)methyl]-1H-imidazoleis useful as reference Impurity standard. -
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Product Name : Losartan Amine Impurity, ; (1-((2′-(1H-tetrazol-5-yl)-[1,1′-biphenyl]-4-yl)methyl)-2-butyl-4-chloro-1H-imidazol-5-yl)methanamine | 141949-89-5
Code: JCLOS-23 CAS: 141949-89-5 Chemical Formula: C22H24ClN7 Molecular Weight: 421.93 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Amine Impurity, ; (1-((2'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-4-yl)methyl)-2-butyl-4-chloro-1H-imidazol-5-yl)methanamine | 141949-89-5 is useful as reference Impurity standard. -
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Product Name : Candesartan Trityl Methyl Ether Impurity ; Irbesartan Trityl Methyl Ether Impurity ; Losartan Trityl Methyl Ether Impurity ; Valsartan Trityl Methyl Ether Impurity ; Triphenylmethyl Methyl Ether ; Trityl Methyl Ether ;
Code: JCLOS-22 CAS: 596-31-6 Chemical Formula: C20H18O Molecular Weight: 274.3 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Candesartan Trityl Methyl Ether Impurity ; Irbesartan Trityl Methyl Ether Impurity ; Losartan Trityl Methyl Ether Impurity ; Valsartan Trityl Methyl Ether Impurity ; Triphenylmethyl Methyl Ether ; Trityl Methyl Ether ; 596-31-6 is useful as reference Impurity standard -
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Product Name : N1-Triphenylmethyl Losartan ; N1-Trityl Losartan ; 2-Butyl-4-chloro-1-[[2′-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1′-biphenyl-4-yl]methyl]-1H-imidazole-5-methanol ; CAS # ;
Code: JCLOS-21 CAS: 124751-00-4 Chemical Formula: C41H37ClN6O Molecular Weight: 665.23 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: N1-Triphenylmethyl Losartan ; N1-Trityl Losartan ; 2-Butyl-4-chloro-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl-4-yl]methyl]-1H-imidazole-5-methanol ; 124751-00-4 is useful as reference Impurity standard -
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Product Name : N1,O-Ditrityl Losartan ; 2-Butyl-4-chloro-1-[[2′-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1′-biphenyl-4-yl]methyl]-1H-imidazole-5-(trityloxy)methyl ether ; CAS # ; ;
Code: JCLOS-20 CAS: 1216554-14-1 Chemical Formula: C60H51ClN6O Molecular Weight:907.54 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: N1,O-Ditrityl Losartan ; 2-Butyl-4-chloro-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl-4-yl]methyl]-1H-imidazole-5-(trityloxy)methyl ether ; 1216554-14-1 is useful as reference Impurity standard -
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Product Name : Losartan Hydroxy N1-Trityl Impurity ; Candesartan Hydroxy N1-Trityl Impurity ; 5-(4′-(Hydroxymethyl)(1,1′-biphenyl)-2-yl)-1-trityl-1H-tetrazole ;
Code: JCLOS-19 CAS: NA Chemical Formula: C33H26N4O Molecular Weight: 494.59 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Hydroxy N1-Trityl Impurity ; Candesartan Hydroxy N1-Trityl Impurity ; 5-(4'-(Hydroxymethyl)(1,1'-biphenyl)-2-yl)-1-trityl-1H-tetrazole ; is useful as reference Impurity standard -
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Product Name : Losartan Carboxylic Acid;2-Butyl-4-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-5-formic acid ; Losartan Acid Metabolite
Code: JCLOS-18 CAS: 124750-92-1 Chemical Formula: C22H21ClN6O2: Molecular Weight: 436.89 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Carboxylic Acid;2-Butyl-4-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-5-formic acid ; Losartan Acid Metabolite124750-92-1 is useful as reference Impurity standard -
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Product Name : Losartan Bromo N1-Trityl Impurity; Candesartan Bromo N1-Trityl Impurity ; Irbesartan Bromo N1-Trityl Impurity ; 5-(4′-(Bromomethyl)(1,1′-biphenyl)-2-yl)-1-trityl-1H-tetrazole ;
Code: JCLOS-17 CAS: 124750-51-2 Chemical Formula: C33H25BrN4 Molecular Weight: 557.48 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Bromo N1-Trityl Impurity; Candesartan Bromo N1-Trityl Impurity ; Irbesartan Bromo N1-Trityl Impurity ; 5-(4'-(Bromomethyl)(1,1'-biphenyl)-2-yl)-1-trityl-1H-tetrazole ;124750-51-2 is useful as reference Impurity standard -
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Product Name : Losartan Aldehyde N1-Trityl Impurity ; 2-Butyl-4-chloro-1-[p-(1-(triphenylmethyl)-1H-tetrazol-5-ylphenyl)benzyl] imidazole-5-formaldehyde ;
Code: JCLOS-16 CAS: NA Chemical Formula: C41H35ClN6O Molecular Weight: 663.21 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Aldehyde N1-Trityl Impurity ; 2-Butyl-4-chloro-1-[p-(1-(triphenylmethyl)-1H-tetrazol-5-ylphenyl)benzyl] imidazole-5-formaldehyde ; is useful as reference Impurity standard -
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Product Name : Losartan Acetyloxy N1-Trityl Impurity ; Candesartan Acetyloxy N1-Trityl Impurity ; Irbesartan Acetyloxy N1-Trityl Impurity ; 5-(4′-(Acetyloxymethyl)(1,1′-biphenyl)-2-yl)-1-trityl-1H-tetrazole ;
Code: JCLOS-15 CAS: NA Chemical Formula: C35H28N4O2 Molecular Weight:536.62 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Acetyloxy N1-Trityl Impurity ; Candesartan Acetyloxy N1-Trityl Impurity ; Irbesartan Acetyloxy N1-Trityl Impurity ; 5-(4'-(Acetyloxymethyl)(1,1'-biphenyl)-2-yl)-1-trityl-1H-tetrazole ; is useful as reference Impurity standard -
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Product Name : Losartan Acetyloxy Impurity ; Candesartan Acetyloxy Impurity ; 5-(4′-(Acetyloxymethyl)(1,1′-biphenyl)-2-yl)-1H-tetrazole
Code: JCLOS-14 CAS: Chemical Formula: C16H14N4O2 Molecular Weight:294.31 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Acetyloxy Impurity ; Candesartan Acetyloxy Impurity ; 5-(4'-(Acetyloxymethyl)(1,1'-biphenyl)-2-yl)-1H-tetrazole is useful as reference Impurity standard -
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Product Name : Losartan Impurity K ; Losartan RC C ; Losartan Aldehyde ; 2-Butyl-4-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-5-formaldehyde
Code: JCLOS-13 CAS: 114798-36-6 Chemical Formula: C22H21ClN6O Molecular Weight:420.89 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity K ; Losartan RC C ; Losartan Aldehyde ; 2-Butyl-4-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-5-formaldehyde 114798-36-6 is useful as reference Impurity standard -
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Product Name : Losartan EP Impurity J ; Losartan USP RC B ; O-Acetyl Losartan ; Losartan Acetate ; (2-Butyl-4-chloro-1-{[2′-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl}-1H-imidazol-5-yl)methyl acetate ;
Code: JCLOS-12 CAS: 1006062-27-6 Chemical Formula: C24H25ClN6O2 Molecular Weight: 464.95 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan EP Impurity J ; Losartan USP RC B ; O-Acetyl Losartan ; Losartan Acetate ; (2-Butyl-4-chloro-1-{[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl}-1H-imidazol-5-yl)methyl acetate ;1006062-27-6 is useful as reference Impurity standard -
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Product Name : Losartan EP Impurity I ; O-Trityl Losartan ; Losartan Trityl Ether ; 5-[4′-[[2-Butyl-4-chloro-5-[(triphenyl methoxy)methyl]-1H-imidazol-1-yl]methyl] [1,1′-biphenyl]-2-yl]-2H-tetrazole ;
Code: JCLOS-11 CAS: 1006062-28-7 Chemical Formula: C41H37ClN6O Molecular Weight: 665.23 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan EP Impurity I ; O-Trityl Losartan ; Losartan Trityl Ether ; 5-[4'-[[2-Butyl-4-chloro-5-[(triphenyl methoxy)methyl]-1H-imidazol-1-yl]methyl] [1,1'-biphenyl]-2-yl]-2H-tetrazole ;1006062-28-7 is useful as reference Impurity standard -
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Product Name : Losartan Impurity H; Losartan N2-Trityl Impurity ; N2-Trityl Losartan ; 2-Butyl-4-chloro-1-[[2′-[2-(triphenylmethyl)-2H-tetrazol-5-yl][1,1′-biphenyl-4-yl]methyl]-1H-imidazole-5-methanol ;
Code: JCLOS-10 CAS: 133909-99-6 Chemical Formula: C41H37ClN6O Molecular Weight:665.23 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity H; Losartan N2-Trityl Impurity ; N2-Trityl Losartan ; 2-Butyl-4-chloro-1-[[2'-[2-(triphenylmethyl)-2H-tetrazol-5-yl][1,1'-biphenyl-4-yl]methyl]-1H-imidazole-5-methanol ;133909-99-6 is useful as reference Impurity standard -
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Product Name : Losartan Impurity G ; Losartan Trityl Alcohol Impurity ; Triphenylmethanol ; Candesartan Trityl Alcohol Impurity ; Irbesartan Triphenylmethanol Impurity ;
Code: JCLOS-09 CAS: Chemical Formula: C19H16O Molecular Weight: 260.33 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity G ; Losartan Trityl Alcohol Impurity ; Triphenylmethanol ; Candesartan Trityl Alcohol Impurity ; Irbesartan Triphenylmethanol Impurity ; 76-84-6 is useful as reference Impurity standard -
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Product Name : Losartan Impurity F ; Losartan Isopropyl Ether ; 5-[4′-[[2-Butyl-4-chloro-5-[(isopropyloxy)methyl]-1H-imidazol-1-yl]methyl] [1,1′-biphenyl]-2-yl]-2H-tetrazol
Code: JCLOS-08 CAS: NA Chemical Formula: C25H29ClN6O Molecular Weight: 464.99 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity F ; Losartan Isopropyl Ether ; 5-[4'-[[2-Butyl-4-chloro-5-[(isopropyloxy)methyl]-1H-imidazol-1-yl]methyl] [1,1'-biphenyl]-2-yl]-2H-tetrazole is useful as reference Impurity standard -
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Product Name : Losartan Impurity E ; Losartan Methyl Impurity ; Irbesartan Methyl Impurity ; Candesartan Methyl Impurity ; 5-(4′-Methyl-(1,1′-biphenyl)-2-yl)-1H-tetrazole;120568-11-8
Code: JCLOS-07 CAS: 120568-11-8 Chemical Formula: C14H12N4 Molecular Weight: 236.27 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity E ; Losartan Methyl Impurity ; Irbesartan Methyl Impurity ; Candesartan Methyl Impurity ; 5-(4'-Methyl-(1,1'-biphenyl)-2-yl)-1H-tetrazole is useful as reference Impurity standard -
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Product Name : Losartan Impurity D ; Losartan RC A ; 2-Butyl-4-chloro-1H-imidazole-5-carbaldehyde
Code: JCLOS-06 CAS: 83857-96-9 Chemical Formula: C8H11ClN2O Molecular Weight: 186.64 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity D ; Losartan RC A ; 2-Butyl-4-chloro-1H-imidazole-5-carbaldehyde is useful as reference Impurity standard -
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Product Name : Losartan Impurity C ; Isolosartan ; Losartan 5-Chloro Isomer ; 2-Butyl-5-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-4-methanol
Code: JCLOS-05 CAS: 860644-28-6 Chemical Formula: C22H23ClN6O Molecular Weight: 422.91 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity C ; Isolosartan ; Losartan 5-Chloro Isomer ; 2-Butyl-5-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-4-methanol is useful as reference Impurity standard -
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Product Name : Losartan Impurity B ; Losartan Hydroxy Impurity ; Candesartan Hydroxy Impurity ; Irbesartan Hydroxy Impurity ; p-(o-1H-Tetrazol-5-ylphenyl)benzyl alcohol
Code: JCLOS-04 CAS: NA Chemical Formula: C14H12N4O Molecular Weight: 266.12 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity B ; Losartan Hydroxy Impurity ; Candesartan Hydroxy Impurity ; Irbesartan Hydroxy Impurity ; p-(o-1H-Tetrazol-5-ylphenyl)benzyl alcohol is useful as reference Impurity standard -
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Product Name : Losartan Impurity M; Losartan RC E ; Losartan N2-Dimer ; N2-Losartanyl Losartan ; 2-Butyl-1-[[2’-[2-[[2-butyl-4-chloro-1-[[2’-(2H-tetrazol-5-yl)[1,1’-biphenyl]-4-yl]methyl]-1H-imidazol-5-yl]methyl]-2H-tetrazol-5-yl][1,1’-biphenyl]-4-yl]methyl]-4-chloro-1H-imidazole-5-methanol
Code: JCLOS-03 CAS: 230971-72-9 Chemical Formula: C44H44Cl2N12O Molecular Weight: 827.81 Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities Literature: Application: Losartan Impurity M; Losartan RC E ; Losartan N2-Dimer ; N2-Losartanyl Losartan ; 2-Butyl-1-[[2’-[2-[[2-butyl-4-chloro-1-[[2’-(2H-tetrazol-5-yl)[1,1’-biphenyl]-4-yl]methyl]-1H-imidazol-5-yl]methyl]-2H-tetrazol-5-yl][1,1’-biphenyl]-4-yl]methyl]-4-chloro-1H-imidazole-5-methanol is useful as reference Impurity standard