Candesartan

19 Results Found

Page 1 of 1
view as:  

Candesartan

  • Free

    Product Name : N-[[2′-(1H-Tetrazol-5-Yl)[1,1′-Biphenyl]-4-Yl]Methyl]Amine ;2′-(2H-Tetrazol-5-yl)[1,1′-biphenyl]-4-methanamine; [4-[2-(2H-Tetrazol-5-yl)phenyl]phenyl]methanamine | 147225-68-1

    Code: JCCAN-19
    CAS: 147225-68-1
    Chemical Formula: C14H13N5
    Molecular Weight: 251.29
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: N-[[2'-(1H-Tetrazol-5-Yl)[1,1'-Biphenyl]-4-Yl]Methyl]Amine ;2'-(2H-Tetrazol-5-yl)[1,1'-biphenyl]-4-methanamine; [4-[2-(2H-Tetrazol-5-yl)phenyl]phenyl]methanamine | 147225-68-1  is useful as reference Impurity standard.
    N-[[2'-(1H-Tetrazol-5-Yl)[1,1'-Biphenyl]-4-Yl]Methyl]Amine ;2'-(2H-Tetrazol-5-yl)[1,1'-biphenyl]-4-methanamine; [4-[2-(2H-Tetrazol-5-yl)phenyl]phenyl]methanamine   | 147225-68-1
  • Free

    Product Name : Candesartan Impurity-Methyl 2-Ethoxy-3-H ;Methyl 2-ethoxy-1H-benzo[d]imidazole-7-carboxylate, | 150058-27-8

    Code: JCCAN-18
    CAS: 150058-27-8
    Chemical Formula: C11H12N2O3
    Molecular Weight: 220.22
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Impurity-Methyl 2-Ethoxy-3-H ;Methyl 2-ethoxy-1H-benzo[d]imidazole-7-carboxylate, | 150058-27-8is useful as reference Impurity standard.
    Candesartan Impurity-Methyl 2-Ethoxy-3-H ;Methyl 2-ethoxy-1H-benzo[d]imidazole-7-carboxylate,  | 150058-27-8
  • Free

    Product Name : Candesatran Inhouse Impurity 2; ethyl2-(((2′-(1H-tetrazol-5-yl)-[1,1′-biphenyl]-4-yl)methyl)amino)-3-nitrobenzoate

    Code: JCCAN-17
    CAS: NA
    Chemical Formula:C23H20N6O4
    Molecular Weight:444.45
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application:Candesatran Inhouse Impurity 2; ethyl2-(((2'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-4-yl)methyl)amino)-3-nitrobenzoate is useful as reference Impurity standard.
    Candesatran Inhouse Impurity 2;  ethyl2-(((2'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-4-yl)methyl)amino)-3-nitrobenzoate
  • Free

    Product Name : Candesartan Methyl Impurity ; Irbesartan Methyl Impurity ; Losartan Impurity E ; Losartan Methyl Impurity ; 5-(4′-Methyl-(1,1′-biphenyl)-2-yl)-1H-tetrazole

    Code: JCCAN-16
    CAS: NA
    Chemical Formula: C14H12N4
    Molecular Weight: 236.2
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Methyl Impurity ; Irbesartan Methyl Impurity ; Losartan Impurity E ; Losartan Methyl Impurity ; 5-(4'-Methyl-(1,1'-biphenyl)-2-yl)-1H-tetrazole is useful as reference Impurity standard.
    Candesartan Methyl Impurity ; Irbesartan Methyl Impurity ; Losartan Impurity E ; Losartan Methyl Impurity ; 5-(4'-Methyl-(1,1'-biphenyl)-2-yl)-1H-tetrazole
  • Free

    Product Name : Candesartan Hydroxy Impurity ; Losartan Hydroxy Impurity ; Losartan EP Impurity B ; Irbesartan Hydroxy Impurity ; p-(o-1H-Tetrazol-5-ylphenyl)benzyl alcohol

    Code: JCCAN-15
    CAS: NA
    Chemical Formula: C14H12N4O
    Molecular Weight: 252.27
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Hydroxy Impurity ; Losartan Hydroxy Impurity ; Losartan EP Impurity B ; Irbesartan Hydroxy Impurity ; p-(o-1H-Tetrazol-5-ylphenyl)benzyl alcohol is useful as reference Impurity standard.
    Candesartan Hydroxy Impurity ; Losartan Hydroxy Impurity ; Losartan EP Impurity B ; Irbesartan Hydroxy Impurity ; p-(o-1H-Tetrazol-5-ylphenyl)benzyl alcohol
  • Free

    Product Name : Candesartan Trityl Alcohol Impurity ; Triphenylmethanol ; Losartan EP Impurity G ; Trityl Alcohol ; Irbesartan Triphenylmethanol Impurity | 76-84-6

    Code: JCCAN-14
    CAS: 76-84-6
    Chemical Formula: C19H16O
    Molecular Weight: 260.3
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Trityl Alcohol Impurity ; Triphenylmethanol ; Losartan EP Impurity G ; Trityl Alcohol ; Irbesartan Triphenylmethanol Impurity | 76-84-6 is useful as reference Impurity standard.
    Candesartan Trityl Alcohol Impurity ; Triphenylmethanol ; Losartan EP Impurity G ; Trityl Alcohol ; Irbesartan Triphenylmethanol Impurity  |  76-84-6
  • Free

    Product Name : Candesartan Trityl Methyl Ether Impurity ; Triphenylmethyl Methyl Ether ; Losartan Trityl Methyl Ether Impurity ; Irbesartan Trityl Methyl Ether Impurity | 596-31-6

    Code: JCCAN-13
    CAS: 596-31-6
    Chemical Formula: C20H18O
    Molecular Weight: 274.36
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Trityl Methyl Ether Impurity ; Triphenylmethyl Methyl Ether ; Losartan Trityl Methyl Ether Impurity ; Irbesartan Trityl Methyl Ether Impurity | 596-31-6 is useful as reference Impurity standard.
    Candesartan Trityl Methyl Ether Impurity ; Triphenylmethyl Methyl Ether ; Losartan Trityl Methyl Ether Impurity ; Irbesartan Trityl Methyl Ether Impurity   |  596-31-6
  • Free

    Product Name : Irbesartan Bromo Nitrile Impurity ; 4′-(Bromomethyl)biphenyl-2-carbonitrile | 114772-54-2

    Code: JCCAN-12
    CAS: 114772-54-2
    Chemical Formula: C14H10BrN
    Molecular Weight: 272.14
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application:  Irbesartan Bromo Nitrile Impurity ; 4'-(Bromomethyl)biphenyl-2-carbonitrile | 114772-54-2 is useful as reference Impurity standard.
    Irbesartan Bromo Nitrile Impurity ; 4'-(Bromomethyl)biphenyl-2-carbonitrile  |  	114772-54-2
  • Free

    Product Name : Candesartan Cilexetil N1-Trityl Methoxy Analog ; N1-Trityl Candesartan Cilexetil Methoxy Analogue ; 2-Methoxy-1-[[2′-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1′-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil N1-Trityl Methoxy Analog] | 1246818-56-3

    Code: JCCAN-11
    CAS:1246818-56-3
    Chemical Formula: C51H46N6O6
    Molecular Weight: 838.35
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil N1-Trityl Methoxy Analog ; N1-Trityl Candesartan Cilexetil Methoxy Analogue ; 2-Methoxy-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil N1-Trityl Methoxy Analog] | 1246818-56-3 is useful as reference Impurity standard.
    Candesartan Cilexetil N1-Trityl Methoxy Analog ;  N1-Trityl Candesartan Cilexetil Methoxy Analogue ;  2-Methoxy-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil N1-Trityl Methoxy Analog]  |  1246818-56-3
  • Free

    Product Name : Candesartan Cilexetil Methoxy Analog (HCl Salt) ; 2-Methoxy-1-[[2′-(2H-tetrazol-5-yl)[1,1′-biphenyl]-4-yl]methyl]-1H-benz imidazole-7-carboxylic acid 1- [[(cyclohexyloxy) carbonyl] oxy] ethyl ester hydrochloride;[Candesartan Cilexetil Methoxy Analog] | 1026042-12-5

    Code: JCCAN-10
    CAS: 1026042-12-5
    Chemical Formula: C32H33ClN6O6
    Molecular Weight: 596.33
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil Methoxy Analog (HCl Salt) ; 2-Methoxy-1-[[2'-(2H-tetrazol-5-yl)[1,1'-biphenyl]-4-yl]methyl]-1H-benz imidazole-7-carboxylic acid 1- [[(cyclohexyloxy) carbonyl] oxy] ethyl ester hydrochloride;[Candesartan Cilexetil Methoxy Analog] | 1026042-12-5 is useful as reference Impurity standard.
    Candesartan Cilexetil Methoxy Analog (HCl Salt) ;  2-Methoxy-1-[[2'-(2H-tetrazol-5-yl)[1,1'-biphenyl]-4-yl]methyl]-1H-benz imidazole-7-carboxylic acid 1- [[(cyclohexyloxy) carbonyl] oxy] ethyl ester hydrochloride;[Candesartan Cilexetil Methoxy Analog]   | 1026042-12-5
  • Free

    Product Name : Candesartan Methyl Ester ; 2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid methyl ester; [Candesartan Cilexetil Impurity I] | 139481-69-9

    Code: JCCAN-09
    CAS: 139481-69-9
    Chemical Formula: C25H22N6O3
    Molecular Weight: 454.48
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Methyl Ester ; 2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid methyl ester; [Candesartan Cilexetil Impurity I] | 139481-69-9 is useful as reference Impurity standard.
    Candesartan Methyl Ester ;  2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid methyl ester; [Candesartan Cilexetil Impurity I]  |  139481-69-9
  • Free

    Product Name : Candesartan Cilexetil N1-Trityl Analog ; N1-Trityl Candesartan Cilexetil ; 2-Ethoxy-1-[[2′-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1′-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity H]

    Code: JCCAN-08
    CAS:170791-09-0
    Chemical FormulaC52H48N6O6
    Molecular Weight: 852.97
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application:  Candesartan Cilexetil N1-Trityl Analog ; N1-Trityl Candesartan Cilexetil ; 2-Ethoxy-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity H] |  139481-59-7 is useful as reference Impurity standard.
     
    Candesartan Cilexetil N1-Trityl Analog ;  N1-Trityl Candesartan Cilexetil ;  2-Ethoxy-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity H]
  • Free

    Product Name : Candesartan (Acid) ; 2-Ethoxy-3-[[4-[2-(1H-tetrazol-5-yl)phenyl]phenyl]methyl]-3H-benzoimidazole-4-carboxylic acid;[Candesartan Cilexetil Impurity G]

    Code:JCCAN-07
    CAS914613-36-8
    Chemical FormulaC35H38N6O6
    Molecular Weight: 638.71
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan (Acid) ; 2-Ethoxy-3-[[4-[2-(1H-tetrazol-5-yl)phenyl]phenyl]methyl]-3H-benzoimidazole-4-carboxylic acid;[Candesartan Cilexetil Impurity G] | 914613-36-8 is useful as reference Impurity standard.
     
    Candesartan (Acid) ;  2-Ethoxy-3-[[4-[2-(1H-tetrazol-5-yl)phenyl]phenyl]methyl]-3H-benzoimidazole-4-carboxylic acid;[Candesartan Cilexetil Impurity G]
  • Free

    Product Name : Candesartan Cilexetil N2-Ethyl Impurity ; 2H-N2-Ethyl Candesartan Cilexetil ; 2-Ethoxy-1-[[2′-[2-ethyl-1H-tetrazol-5-yl][1,1′-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity F]

    Code:JCCAN-06
    CAS: 914613-35-7
    Chemical Formula: C35H38N6O6
    Molecular Weight: 638.71
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil N2-Ethyl Impurity ; 2H-N2-Ethyl Candesartan Cilexetil ; 2-Ethoxy-1-[[2'-[2-ethyl-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity F] |  914613-35-7 is useful as reference Impurity standard.
     
    Candesartan Cilexetil N2-Ethyl Impurity ;  2H-N2-Ethyl Candesartan Cilexetil ;  2-Ethoxy-1-[[2'-[2-ethyl-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity F]
  • Free

    Product Name : Candesartan Cilexetil N1-Ethyl Analog ; 1H-N1-Ethyl Candesartan Cilexetil ; 2-Ethoxy-1-[[2′-[1-ethyl-1H-tetrazol-5-yl][1,1′-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity E]

    Code: JCCAN-05
    CAS: 914613-35-7
    Chemical Formula: C35H38N6O6
    Molecular Weight: 638.71
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil N1-Ethyl Analog ; 1H-N1-Ethyl Candesartan Cilexetil ; 2-Ethoxy-1-[[2'-[1-ethyl-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity E] | 914613-35-7 is useful as reference Impurity standard.
     
    Candesartan Cilexetil N1-Ethyl Analog ;  1H-N1-Ethyl Candesartan Cilexetil ;  2-Ethoxy-1-[[2'-[1-ethyl-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid 1-[[(cyclohexyloxy) carbonyl]oxy]ethyl ester; [Candesartan Cilexetil Impurity E]
  • Free

    Product Name : Candesartan Cilexetil N2-Ethyl Amide ; Candesartan Cilexetil O-Desethyl N2-Ethyl Analog ; 2-Desethoxy-2-Hydroxy-2H-N2-Ethyl Candesartan Cilexetil ; (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(2-ethyl-2H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate ;[Candesartan Cilexetil Impurity D]

    Code: JCCAN-04
    CAS: 1185256-03-4
    Chemical Formula: C33H34N6O6
    Molecular Weight: 610.66
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil N2-Ethyl Amide ; Candesartan Cilexetil O-Desethyl N2-Ethyl Analog ; 2-Desethoxy-2-Hydroxy-2H-N2-Ethyl Candesartan Cilexetil ; (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(2-ethyl-2H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate ;[Candesartan Cilexetil Impurity D] | 1185256-03-4 is useful as reference Impurity standard.
    Candesartan Cilexetil N2-Ethyl Amide ;   Candesartan Cilexetil O-Desethyl N2-Ethyl Analog ;  2-Desethoxy-2-Hydroxy-2H-N2-Ethyl Candesartan Cilexetil ;  (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(2-ethyl-2H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate ;[Candesartan Cilexetil Impurity D]
  • Free

    Product Name : Candesartan Cilexetil N1-Ethyl Amide ; Candesartan Cilexetil O-Desethyl N1-Ethyl Impurity ; 2-Desethoxy-2-Hydroxy-1H-N1-Ethyl Candesartan Cilexetil ; (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(1-ethyl-1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate [Candesartan Cilexetil Impurity C]

    Code: JCCAN-03
    CAS: 1185255-99-5
    Chemical Formula: C33H34N6O6
    Molecular Weight: 610.66
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature: 
    Application: Candesartan Cilexetil N1-Ethyl Amide ; Candesartan Cilexetil O-Desethyl N1-Ethyl Impurity ; 2-Desethoxy-2-Hydroxy-1H-N1-Ethyl Candesartan Cilexetil ; (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(1-ethyl-1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate [Candesartan Cilexetil Impurity C] | 1185255-99-5 is useful as reference Impurity standard.
     
    Candesartan Cilexetil N1-Ethyl Amide ;  Candesartan Cilexetil O-Desethyl N1-Ethyl Impurity ;  2-Desethoxy-2-Hydroxy-1H-N1-Ethyl Candesartan Cilexetil ;  (1RS)-1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl 3-[[2′-(1-ethyl-1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate [Candesartan Cilexetil Impurity C]
  • Free

    Product Name : Candesartan Cilexetil Desethyl Analog ; 1-(Cyclohexyloxycarbonyloxy)ethyl 1-((2′-(1H-tetrazol-5-yl)biphenyl-4-yl) methyl)-2-hydroxy-1H-benzo[d]imidazole-7-carboxylate [Candesartan Cilexetil Impurity B]

    Code: JCCAN-02
    CAS: 869631-11-8
    Chemical Formula:C31H30N6O6
    Molecular Weight: 582.61
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: Candesartan Cilexetil Desethyl Analog ; 1-(Cyclohexyloxycarbonyloxy)ethyl 1-((2'-(1H-tetrazol-5-yl)biphenyl-4-yl) methyl)-2-hydroxy-1H-benzo[d]imidazole-7-carboxylate [Candesartan Cilexetil Impurity B] | 869631-11-8 is useful as reference Impurity standard.
     
    Candesartan Cilexetil Desethyl Analog ;  1-(Cyclohexyloxycarbonyloxy)ethyl 1-((2'-(1H-tetrazol-5-yl)biphenyl-4-yl) methyl)-2-hydroxy-1H-benzo[d]imidazole-7-carboxylate [Candesartan Cilexetil Impurity B]
  • Free

    Product Name : 2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic Acid ethyl ester [Candesartan Cilexetil Impurity A]

    Code: JCCAN-01
    CAS: 139481-58-6
    Chemical Formula: C26H24N6O3
    Molecular Weight: 468.51
    Category: Reference Standards/API Drug Metabolites/EP Impurities/USP Impurities
    Literature:
    Application: 2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic Acid ethyl ester [Candesartan Cilexetil Impurity A] |  139481-58-6 is useful as reference Impurity standard.
     
    2-Ethoxy-1-[[2-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H-benzimidazole-7-carboxylic Acid ethyl ester [Candesartan Cilexetil Impurity A]