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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
1,8-dibenzyl-1,4,8,11-tetraazacyclotetradecane tetrahydrochloride 1,8-dibenzyl-1,4,8,11-tetraazacyclotetradecane tetrahydrochloride 267241-20-3 C24H37ClN4
(3S,3'S,4R,4'R)-3,3'-(oxybis(methylene))bis(4-(4-fluorophenyl)-1- methylpiperidine) (3S,3'S,4R,4'R)-3,3'-(oxybis(methylene))bis(4-(4-fluorophenyl)-1- methylpiperidine) C26H34F2N2O
DexMedetoMidine IMpurity 15 DexMedetoMidine IMpurity 15
Canagliflozin Impurity 1 Canagliflozin Impurity 1
Vonoprazan Impurity 24 Vonoprazan Impurity 24
Esomeprazole Impurity Esomeprazole Impurity
Esomeprazole Impurity 27 Esomeprazole Impurity 27
Amlodipine Impurity 30 Amlodipine Impurity 30 1089674-39-4 C26H31ClN2O8S
Alogliptin Impurity 30 Alogliptin Impurity 30
Olaparib Impurity 27 Olaparib Impurity 27
Hydrocortisone Impurity 14 Hydrocortisone Impurity 14 C21H30O5
Teneligliptin Impurity 5 Teneligliptin Impurity 5
Erlotinib Hydrochloride iMpurity 54 Erlotinib Hydrochloride iMpurity 54
Aciclovir EP Impurity N Aciclovir EP Impurity N
Vonoprazan Impurity U2 Vonoprazan Impurity U2
Parecoxib SodiuM iMpurity 36 Parecoxib SodiuM iMpurity 36
phenyl (3R,4R)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4- fluorophenyl)piperidine-1-carboxylate compound phenyl (3R,4R)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4- fluorophenyl)piperidine-1-carboxylate compound 105812-85-9 C26H24FNO5
Apixaban Impurity A25 Apixaban Impurity A25
Trelagliptin IMpurity 32 Trelagliptin IMpurity 32
Afatinib Impurity 77 Afatinib Impurity 77 26404-20-6 C5H7ClO3
2a,3a,16a,17a-Diepoxy-17b-acetoxy-5a-androstane 2a,3a,16a,17a-Diepoxy-17b-acetoxy-5a-androstane 50588-22-2 C21H30O4
bis(6-(((3S,4R)-4-(4-fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-5-yl)methane bis(6-(((3S,4R)-4-(4-fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-5-yl)methane 2105932-71-4 C39H40F2N2O6
Tenofovir Impurity 60 Tenofovir Impurity 60
((3R,4S)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate ((3R,4S)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate 1258537-32-4 C20H24FNO3S
Mupirocin Calcium EP Impurity H Mupirocin Calcium EP Impurity H C26H44CaO9
Tricyclo[3.3.1.13,7]decane-1,3-diol, 5-amino- Tricyclo[3.3.1.13,7]decane-1,3-diol, 5-amino- 1382839-19-1 C10H17NO2
(trans)-phenyl 3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4- methoxyphenyl)piperidine-1-carboxylate (trans)-phenyl 3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4- methoxyphenyl)piperidine-1-carboxylate C27H27NO6
Org198786-1 Org198786-1 2412952-96-4 C71H114NNaO46S7
2-Thiazolamine, 4-(4-bromo-2-thienyl)- 2-Thiazolamine, 4-(4-bromo-2-thienyl)- 81216-89-9 C7H5BrN2S2
Elagolix Sodium impurity4 Elagolix Sodium impurity4 2248628-92-2 C19H21NO4S
Tadalafil Impurity 45 Tadalafil Impurity 45
(R)-3-((R)-3-(naphthalen-1-yloxy)-1-phenylpropoxy)-1-phenylpropan-1-ol (R)-3-((R)-3-(naphthalen-1-yloxy)-1-phenylpropoxy)-1-phenylpropan-1-ol C28H28O3
(trans)-4-((2-amino-4,5-dibromobenzyl)amino)cyclohexanol (trans)-4-((2-amino-4,5-dibromobenzyl)amino)cyclohexanol C13H18Br2N2O
Edaravone Impurity Edaravone Impurity
1-Butanesulfonic acid, 4-hydroxy-, methyl ester 1-Butanesulfonic acid, 4-hydroxy-, methyl ester 343928-18-7 C5H12O4S
Fesoterodine Impurity 17 Fesoterodine Impurity 17
1-(4-((1,4,8,11-tetraazacyclotetradecan-1-yl)methyl)benzyl)-1,4,8,11-tetraazacyclotetradecane 1-oxide 1-(4-((1,4,8,11-tetraazacyclotetradecan-1-yl)methyl)benzyl)-1,4,8,11-tetraazacyclotetradecane 1-oxide C28H54N8O
Cabozantinib impurity DX2 Cabozantinib impurity DX2 1628530-38-0 C28H24FN3O6
Selegiline Impurity (224Da) Selegiline Impurity (224Da)
Oxybutynin Impurity(MW 481Da) Oxybutynin Impurity(MW 481Da)
Vitamin K1 hydroxylated Impurity Vitamin K1 hydroxylated Impurity
2,2'-(4,10-bis((trans)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid 4HCl 2,2'-(4,10-bis((trans)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid 4HCl
Cefdinir CP Impurity F Cefdinir CP Impurity F
Ceftazidime Oxide Impurity 1 Ceftazidime Oxide Impurity 1
Nifuratel Impurity 21 Nifuratel Impurity 21
Ornidazole Impurity 15 Ornidazole Impurity 15 105687-87-4 C7H9ClN4O5
2-(Dimethylamino)ethyl 4-methylbenzenesulfonate 2-(Dimethylamino)ethyl 4-methylbenzenesulfonate 123091-15-6 C11H17NO3S
Vildagliptin I Impurity Vildagliptin I Impurity 1811569-16-0 C7H9IN2O
Acemetacin EP Impurity D/6-t-Butyl Acemetacin/[[[1-(4-Chlorobenzoyl)-6-(1,1-dimethylethyl)-5-methoxy-2-methyl-1H-indol-3-yl]acetyl]oxy]acetic acid Acemetacin EP Impurity D/6-t-Butyl Acemetacin/[[[1-(4-Chlorobenzoyl)-6-(1,1-dimethylethyl)-5-methoxy-2-methyl-1H-indol-3-yl]acetyl]oxy]acetic acid 76812-64-1 C25H26ClNO6
Pregabalin Impurity 38 Pregabalin Impurity 38 1141362-94-8 C8H15NO2
Acemetacin Impurity Ｄ Acemetacin Impurity Ｄ
6,6'-oxybis(3-formylbenzonitrile) 6,6'-oxybis(3-formylbenzonitrile)
4-乙基-2,3-二氧代-N-苯基哌嗪-1-甲酰胺 4-乙基-2,3-二氧代-N-苯基哌嗪-1-甲酰胺 65322-79-4 C13H15N3O3
Cabozantinib Impurity EXA Cabozantinib Impurity EXA 1431468-36-8 C17H14F2N2O2
Tafluprost Impurity 13 Tafluprost Impurity 13
ZOLPIDEM IMPURITY A ZOLPIDEM IMPURITY A 1346600-85-8 C19H21N3O
Carbamic acid, N-[(1S,2S,4S)-2-hydroxy-4-[[(2-methylpropoxy)carbonyl]amino]-5-phenyl-1-(phenylmethyl)pentyl]-, 5-thiazolylmethyl ester Carbamic acid, N-[(1S,2S,4S)-2-hydroxy-4-[[(2-methylpropoxy)carbonyl]amino]-5-phenyl-1-(phenylmethyl)pentyl]-, 5-thiazolylmethyl ester 1010809-39-8 C28H35N3O5S
Piperazine, 1,4-bis[2-[(2,4-dimethylphenyl)thio]phenyl]- Piperazine, 1,4-bis[2-[(2,4-dimethylphenyl)thio]phenyl]- 2243045-82-9 C32H34N2S2
2-amino-4-methoxy-5-(3-morpholin-4-ylpropoxy)benzoic acid 2-amino-4-methoxy-5-(3-morpholin-4-ylpropoxy)benzoic acid 1640351-46-7 C15H22N2O5
3-Desoxyvitamin D3 3-Desoxyvitamin D3 69662-75-5 C27H44
cis-Vitamin K2 cis-Vitamin K2 65061-19-0 C31H40O2
N,N'-((5-methylisoxazole-3,4-diyl)bis(3,1-phenylenesulfonyl))dipropionamide disodium salt N,N'-((5-methylisoxazole-3,4-diyl)bis(3,1-phenylenesulfonyl))dipropionamide disodium salt
Zanubrutinib Impurity Zanubrutinib Impurity
(O-Isobutyryl (R)-Fesoterodine (O-Isobutyryl (R)-Fesoterodine 1795786-25-2 C30H43NO4
Cefdinir Degradation Impurity 1 Cefdinir Degradation Impurity 1
Cephalexin Impurity C2 Cephalexin Impurity C2
Cefalexin Ethyl Homolog 2 Impurity Cefalexin Ethyl Homolog 2 Impurity
Azlocillin Opern-Ring Impurity Azlocillin Opern-Ring Impurity 96688-41-4 C20H25N5O7S
Piperacillin Impurity P Piperacillin Impurity P
1,1'-(((2R,2'R,4R,4'R)-4,4'-(oxybis(methylene))bis(2-(2,4-difluoro phenyl)tetrahydrofuran-4,2-diyl))bis(methylene))bis(1H-1,2,4-triazole) 1,1'-(((2R,2'R,4R,4'R)-4,4'-(oxybis(methylene))bis(2-(2,4-difluoro phenyl)tetrahydrofuran-4,2-diyl))bis(methylene))bis(1H-1,2,4-triazole) 2256739-22-5 C28H28F4N6O3
8-((R)-1-acryloylpiperidin-3-yl)-10-(4-phenoxyphenyl)-1,10b-dihydropyrazolo[4,3-e]pyrimido[1,2-c]pyrimidin-2(8H)-one 8-((R)-1-acryloylpiperidin-3-yl)-10-(4-phenoxyphenyl)-1,10b-dihydropyrazolo[4,3-e]pyrimido[1,2-c]pyrimidin-2(8H)-one
Levosimendan Impurity 16 Levosimendan Impurity 16 2290570-69-1 C11H12N2O
Tolvaptan Impurity 11 Tolvaptan Impurity 11 331947-69-4 C16H14ClNO2
(S)-2-((R)-2,5-dioxo-3-propylpyrrolidin-1-yl)butanamide (S)-2-((R)-2,5-dioxo-3-propylpyrrolidin-1-yl)butanamide 2432911-31-2 C11H18N2O3
(S)-N-((S)-1-amino-1-oxobutan-2-yl)-3-(bromomethyl)hexanamide (S)-N-((S)-1-amino-1-oxobutan-2-yl)-3-(bromomethyl)hexanamide
Peramivir Impurity 17 Peramivir Impurity 17
Peramivir Impurity 23 Peramivir Impurity 23
Silodosin Carboxylic Acid Impurity Silodosin Carboxylic Acid Impurity 1431373-77-1 C25H31F3N2O5
Pramipexole Impurity M Pramipexole Impurity M
Premastast Impurity 2 Premastast Impurity 2
Peramivir Impurity 26 Peramivir Impurity 26
Peramivir Impurity 34 Peramivir Impurity 34
(S)-2-(1-azabicyclo[2.2.2]oct-3-yl)-2,4,5,6-tetrahydro-1H-benz[de]isoquinolin-1-one hydrochloride (S)-2-(1-azabicyclo[2.2.2]oct-3-yl)-2,4,5,6-tetrahydro-1H-benz[de]isoquinolin-1-one hydrochloride
Imatinib impurity BY Imatinib impurity BY
6β-Methylprednisolone 6β-Methylprednisolone 18462-27-6 C22H30O5
DEXTROMETHORPHAN N-OXIDE DEXTROMETHORPHAN N-OXIDE 1177494-18-6 C18H25NO2
1-[(2-CHLOROPHENYL)DIPHENYLMETHYL]-1H-PYRAZOLE 1-[(2-CHLOROPHENYL)DIPHENYLMETHYL]-1H-PYRAZOLE C22H17ClN2
AMOXICILLIN TRIHYDRATE IMP. C (EP): (4S)-2-[5-(4-HYDROXYPHENYL)-3,6-DIOXOPIPERAZIN-2-YL]-5,5-DIMETHYL-THIAZOLIDINE-4-CARBOXYLIC ACID (AMOXICILLIN DIKETOPIPERAZINES) AMOXICILLIN TRIHYDRATE IMP. C (EP): (4S)-2-[5-(4-HYDROXYPHENYL)-3,6-DIOXOPIPERAZIN-2-YL]-5,5-DIMETHYL-THIAZOLIDINE-4-CARBOXYLIC ACID (AMOXICILLIN DIKETOPIPERAZINES)
Celecoxib Impurity 2 Celecoxib Impurity 2 948293-46-7 C11H9F3N2
1-METHYL-4-PHENYL-3-(TRIFLUOROMETHYL)-1H-PYRAZOL-5-AMINE 1-METHYL-4-PHENYL-3-(TRIFLUOROMETHYL)-1H-PYRAZOL-5-AMINE 63156-74-1 C11H10F3N3
AURORA KA-7735 AURORA KA-7735 6487-86-1 C9H13NO2
Sugammadex sodium Impurity 45 Sugammadex sodium Impurity 45
Carboprost Trometamol 1 Carboprost Trometamol 1
Apremilast ImpurityTNN Apremilast ImpurityTNN
Tenofovir Impurity 113 Tenofovir Impurity 113 1335287-28-9 C11H13IN4O
Cefazolin USP Impurity L-δ3 Cefazolin USP Impurity L-δ3
Cabozantinib impurity 38 Cabozantinib impurity 38
Cabozantinib impurity 57 Cabozantinib impurity 57
(2R,3S)-3-(6-(1-(6-chloro-5-fluoropyrimidin-4-yl)ethyl)-5-fluoropyrimidin-4-yl)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol hydrochloride (2R,3S)-3-(6-(1-(6-chloro-5-fluoropyrimidin-4-yl)ethyl)-5-fluoropyrimidin-4-yl)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol hydrochloride
(R)-2-((2R,5R)-3,6-dioxo-5-phenylpiperazin-2-yl)-5-methyl-3,6-dihydro-2H-1,3-thiazine-4-carboxylic acid (R)-2-((2R,5R)-3,6-dioxo-5-phenylpiperazin-2-yl)-5-methyl-3,6-dihydro-2H-1,3-thiazine-4-carboxylic acid 860011-30-9 C16H17N3O4S
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