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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
1-Pyrrolidineacetamide, α-ethyl-4-(1-methylethyl)-2-oxo-, (αS,4S)- 1-Pyrrolidineacetamide, α-ethyl-4-(1-methylethyl)-2-oxo-, (αS,4S)- 357334-83-9 C11H20N2O2
impurity 42 impurity 42
2,2'-(4,10-bis((2S,3R)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid 2,2'-(4,10-bis((2S,3R)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid
Loratadine Impurity 2 Loratadine Impurity 2 167891-69-2 C22H25ClN2O2
Eliglustat (1S,2S)-Isomer (Hemitartrate) Eliglustat (1S,2S)-Isomer (Hemitartrate) 1092472-70-2 C23H36N2O4
3-Azetidineacetic acid, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 3-Azetidineacetic acid, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 2271228-52-3 C16H18N6O4S
Cyclopentanecarboxylic acid, 3-[(1S)-1-amino-2-ethylbutyl]-4-[(aminoiminomethyl)amino]-2-hydroxy-, (1S,2S,3S,4R)- Cyclopentanecarboxylic acid, 3-[(1S)-1-amino-2-ethylbutyl]-4-[(aminoiminomethyl)amino]-2-hydroxy-, (1S,2S,3S,4R)- 2412376-06-6 C13H26N4O3
Peramivir Impurity 49 Peramivir Impurity 49
Peonidin-3-O-Sophoroside- 5-O-β-D-glucoside Peonidin-3-O-Sophoroside- 5-O-β-D-glucoside 81360-22-7 C34H43O21+
1-Pyrrolidinecarboxylic acid, 3,3'-dithiobis[5-[[(3-carboxyphenyl)amino]carbonyl]-, 1,1'-bis[(4-nitrophenyl)methyl] ester, (3S,3'S,5S,5'S)- 1-Pyrrolidinecarboxylic acid, 3,3'-dithiobis[5-[[(3-carboxyphenyl)amino]carbonyl]-, 1,1'-bis[(4-nitrophenyl)methyl] ester, (3S,3'S,5S,5'S)- 1401451-19-1 C40H36N6O14S2
Benzeneacetic acid, α-(hydroxymethyl)-, 9-butyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl ester, [7(S)-(1α,2β,4β,5α,7β)]- (9CI) Benzeneacetic acid, α-(hydroxymethyl)-, 9-butyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl ester, [7(S)-(1α,2β,4β,5α,7β)]- (9CI) 14861-14-4 C20H27NO4
Avatrombopag Impurity 32 Avatrombopag Impurity 32
Cisatracurium besylate impurity 18 Cisatracurium besylate impurity 18
Paclitaxel Impurity1 ABCDEFGHJKL Paclitaxel Impurity1 ABCDEFGHJKL
3-THIOPHENEPROPANAMINE, N,N-DIMETHYL-GAMMA-(1-NAPHTHALENYLOXY)-, ETHANEDIOATE(1:1) 3-THIOPHENEPROPANAMINE, N,N-DIMETHYL-GAMMA-(1-NAPHTHALENYLOXY)-, ETHANEDIOATE(1:1) 116817-26-6 C21H23NO5S
(2R,3S/2S,3R)-2-(2,4-Difluorophenyl)-3-(5-fluoropyrimidin-4-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol (2R,3S/2S,3R)-2-(2,4-Difluorophenyl)-3-(5-fluoropyrimidin-4-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol 182230-43-9 C16H14F3N5O
Bumetanide Impurity 8 Bumetanide Impurity 8
Benzenesulfonamide, N-(2-aminoethyl)-3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f][1,2,4]triazin-2-yl)-4-ethoxy- Benzenesulfonamide, N-(2-aminoethyl)-3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f][1,2,4]triazin-2-yl)-4-ethoxy- 448184-52-9 C19H26N6O4S
Avibactam Impurity 04 Avibactam Impurity 04
Latamoxef Impurity C Latamoxef Impurity C
Carbamic acid, [2-hydroxy-1-methyl-2-[3-(phenylmethoxy)phenyl]ethyl]-, phenylmethyl ester, [R-(R*,S*)]- (9CI) Carbamic acid, [2-hydroxy-1-methyl-2-[3-(phenylmethoxy)phenyl]ethyl]-, phenylmethyl ester, [R-(R*,S*)]- (9CI) 31301-86-7 C24H25NO4
9H-Purine-9-ethanol, 6-amino-β-methyl- 9H-Purine-9-ethanol, 6-amino-β-methyl- 20776-34-5 C8H11N5O
2-amino-5-[(3,4,5-trimethoxyphenyl)methyl]-1H-pyrimidin-4-one 2-amino-5-[(3,4,5-trimethoxyphenyl)methyl]-1H-pyrimidin-4-one 92440-76-1 C14H17N3O4
Edoxaban impurity ABCDEFGHJKL Edoxaban impurity ABCDEFGHJKL
(S)-3-(3-((3-chloro-2-(3,4-dimethoxyphenyl)propyl)(methyl)amino) propyl)-7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one hydrochloride (S)-3-(3-((3-chloro-2-(3,4-dimethoxyphenyl)propyl)(methyl)amino) propyl)-7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one hydrochloride
(2R,3R)-3-amino-2-methyl-4-oxoazetidine-1-sulfonic acid (2R,3R)-3-amino-2-methyl-4-oxoazetidine-1-sulfonic acid
Osimertinib impurity01 Osimertinib impurity01
(±)-N-[3-acetyl-4-[2-hydroxy-3-[(1-methylethyl)amino]propoxy]phenyl]acetamide monohydrochloride (±)-N-[3-acetyl-4-[2-hydroxy-3-[(1-methylethyl)amino]propoxy]phenyl]acetamide monohydrochloride 73899-76-0 C16H25ClN2O4
Hexanoic acid, 6-chloro-3,5-dihydroxy-, (3R,5S)- Hexanoic acid, 6-chloro-3,5-dihydroxy-, (3R,5S)- 958358-67-3 C6H11ClO4
Oseltamivir Impurity 78 Oseltamivir Impurity 78
Oseltamivir Impurity 67 Oseltamivir Impurity 67
Ixazomib Impurity ABCDEFGHJKL Ixazomib Impurity ABCDEFGHJKL
Benzoic acid, 2-[[[4-(2,2-dimethyl-1-oxopropoxy)phenyl]sulfonyl]amino]- Benzoic acid, 2-[[[4-(2,2-dimethyl-1-oxopropoxy)phenyl]sulfonyl]amino]- 188114-98-9 C18H19NO6S
6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one 6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one 43200-81-3 C11H7ClN4O2
2(1H)-Quinolinone,7-(4-chlorobutoxy)- 2(1H)-Quinolinone,7-(4-chlorobutoxy)- 913613-82-8 C13H14ClNO2
-Oxo-a-propylenanthic Acid Ethyl Ester -Oxo-a-propylenanthic Acid Ethyl Ester 96610-56-9 C12H22O3
5'-Deoxy-5-fluoro-N-[(2-methylbutoxy)carbonyl]cytidine 5'-Deoxy-5-fluoro-N-[(2-methylbutoxy)carbonyl]cytidine 910129-15-6 C15H22FN3O6
methyl 2,4-bis{2-nitrophenyl}-6-methyl-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate methyl 2,4-bis{2-nitrophenyl}-6-methyl-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate 108139-78-2 C19H18N4O6
Dehydrodeoxy Donepezil (Donepezil Impurity) Dehydrodeoxy Donepezil (Donepezil Impurity) 120013-45-8 C24H29NO2
Zolmitriptan Zolmitriptan 139264-24-7 C16H21N3O2
2,3-Dimethylstyrene 2,3-Dimethylstyrene 40243-75-2 C10H12
1,1'-Biphenyl-2-ylcarbamic acid 1,1'-Biphenyl-2-ylcarbamic acid 50443-60-2 C13H11NO2
10-[3-(Dimethylamino)propyl]-10H-phenothiazine 5-oxide 10-[3-(Dimethylamino)propyl]-10H-phenothiazine 5-oxide 146-21-4 C17H20N2OS
(6E,10E)-7,11,15-Trimethyl-3-methylene-1,6,10,14-hexadecatetrene (6E,10E)-7,11,15-Trimethyl-3-methylene-1,6,10,14-hexadecatetrene 70901-63-2 C20H32
4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 68128-53-0 C19H33NO13
CLARITHROMYCIN OXIME CLARITHROMYCIN OXIME 127253-06-9 C38H70N2O13
PYRIDINE,3,5-BIS(BROMOMETHYL)- PYRIDINE,3,5-BIS(BROMOMETHYL)- 35991-75-4 C7H7Br2N
alpha-Hydroxy-alpha-phenylbenzeneacetic acid (3-endo)-8-azabicyclo[3.2.1]oct-3-yl ester hydrochloride alpha-Hydroxy-alpha-phenylbenzeneacetic acid (3-endo)-8-azabicyclo[3.2.1]oct-3-yl ester hydrochloride 63516-30-3 C21H24ClNO3
N-(4-(METHYLAMINO)BENZOYL)-L-GLUTAMIC ACID N-(4-(METHYLAMINO)BENZOYL)-L-GLUTAMIC ACID 52980-68-4 C13H16N2O5
(2R)-N-(2,6-DIMETHYLPHENYL)-2-PIPERIDINECARBOXAMIDE (2R)-N-(2,6-DIMETHYLPHENYL)-2-PIPERIDINECARBOXAMIDE 27262-43-7 C14H20N2O
2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid(Anagrelide Impurity B) 2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid(Anagrelide Impurity B) 1159977-03-3 C10H9Cl2N3O2
Aids004544 Aids004544 145397-25-7 C8H10FN3O4
Atorvastatin Lactam Impurity Atorvastatin Lactam Impurity 906552-18-9 C33H35FN2O6
1,3-Bis(9H-carbazol-4-yloxy)-2-propanol (Carvedilol Impurity) 1,3-Bis(9H-carbazol-4-yloxy)-2-propanol (Carvedilol Impurity) 1276477-91-8 C27H22N2O3
Lasmiditan Impurity 5 Lasmiditan Impurity 5
Olodaterol Impurity 18 Olodaterol Impurity 18 2727170-18-3
Febuxostat impurity DAC Febuxostat impurity DAC
ETHYL1-METHYL-2-OXOCYCLOPENTANECARBOXYLATE ETHYL1-METHYL-2-OXOCYCLOPENTANECARBOXYLATE 5453-88-3 C9H14O3
Olodaterol Impurity 27 Olodaterol Impurity 27
(R)-Fluvastatin EP Impurity E (R)-Fluvastatin EP Impurity E
Ethacridine Impurity 9 Ethacridine Impurity 9
isopropyl 2-(2-(4-chlorobenzoyl)phenoxy)-2-methylpropanoate isopropyl 2-(2-(4-chlorobenzoyl)phenoxy)-2-methylpropanoate
32,50-Dicarboxy-cyanoco balamin 32,50-Dicarboxy-cyanoco balamin
Olodaterol Impurity 30 Olodaterol Impurity 30
2-(3,4-dihydroxyphenyl)-2-hydroxy-acetaldehyde 2-(3,4-dihydroxyphenyl)-2-hydroxy-acetaldehyde 13023-73-9 C8H8O4
BRN 0758154 BRN 0758154 69304-48-9 C11H13IN2O5
NSC4751 NSC4751 5393-61-3 C10H10N2O2
Sts 64 Sts 64 24284-84-2 C21H27NO2
2-hydroxy-N-[3-[3-(1-piperidylmethyl)phenoxy]propyl]acetamide 2-hydroxy-N-[3-[3-(1-piperidylmethyl)phenoxy]propyl]acetamide 97900-88-4 C17H26N2O3
Benazepril Related Compound D Benazepril Related Compound D 1347874-67-2 C22H25ClN2O5
2-Cyclopentene-1-carboxylicacid,4-amino-,methylester,(1R,4S)-(9CI) 2-Cyclopentene-1-carboxylicacid,4-amino-,methylester,(1R,4S)-(9CI) 352226-74-5 C7H11NO2
N-methyl-5,6-dihydroxyindole N-methyl-5,6-dihydroxyindole 4821-00-5 C9H9NO2
4-amino-5-chloro-2-ethoxy-N-((2-morpholinyl)methyl)benzamide 4-amino-5-chloro-2-ethoxy-N-((2-morpholinyl)methyl)benzamide 152013-26-8 C14H20ClN3O3
cleistanthin B cleistanthin B 30021-77-3 C27H26O12
lumelysergol lumelysergol 7079-87-0 C16H20N2O2
columbianetin glucopyranoside columbianetin glucopyranoside 55836-35-6 C20H24O9
5'-deoxypyridoxine 5'-deoxypyridoxine 4811-03-4 C8H11NO2
10-deazaaminopterin 10-deazaaminopterin 52454-37-2 C20H21N7O5
phosphoric acid phosphoric acid 790712-60-6 C16H18F6N5O5P
4-(4-AMINO-3-FLUOROPHENOXY)-N-METHYLPICOLINAMIDE 4-(4-AMINO-3-FLUOROPHENOXY)-N-METHYLPICOLINAMIDE 757251-39-1 C13H12FN3O2
3-Bromo-5-chloropyrazine-2-carbonitrile 3-Bromo-5-chloropyrazine-2-carbonitrile 440124-25-4 C5HBrClN3
4,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one (Loratadine Impurity) 4,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one (Loratadine Impurity) 133330-60-6 C14H9Cl2NO
Hydroxy Varenicline Hydroxy Varenicline 357424-21-6 C13H13N3O
ethyl (2S)-pyrrolidine-2-carboxylate ethyl (2S)-pyrrolidine-2-carboxylate 5817-26-5 C7H13NO2
[2R-[2aR*),3a]-2-[1-[3,5-Bis(trifluoromethyl)phenyl]ethoxy]-3-(4-fluorophenyl)morpholine [2R-[2aR*),3a]-2-[1-[3,5-Bis(trifluoromethyl)phenyl]ethoxy]-3-(4-fluorophenyl)morpholine 170729-79-0 C20H18F7NO2
Atorvastatin Lactone Diepoxide Atorvastatin Lactone Diepoxide 1046118-40-4 C33H33FN2O6
2-Carboxybenzoyl Amlodipine 2-Carboxybenzoyl Amlodipine 318465-73-5 C28H29ClN2O8
rac-trans-4-Desfluoro-4-methoxy Paroxetine Hydrochloride rac-trans-4-Desfluoro-4-methoxy Paroxetine Hydrochloride 127017-74-7 C20H24ClNO4
Des(isopropoxyethyl) Bisoprolol Des(isopropoxyethyl) Bisoprolol 62572-93-4 C13H21NO3
Desmethoxy Fluvoxamine Desmethoxy Fluvoxamine 1217216-82-4 C14H19F3N2O
4'-Deoxy Vincristine 4'-Deoxy Vincristine 68135-16-0 C46H56N4O9
Demethyl Chlorpromazine Hydrochloride Demethyl Chlorpromazine Hydrochloride 3953-65-9 C16H18Cl2N2S
6-Hydroxy-6-defluoro Ciprofloxacin 6-Hydroxy-6-defluoro Ciprofloxacin 226903-07-7 C17H19N3O4
N-(2-Succinyl) Fluvoxamine N-(2-Succinyl) Fluvoxamine 259526-43-7 C19H25F3N2O6
Methylene-Bis Paroxetine Dihydrochloride Methylene-Bis Paroxetine Dihydrochloride 606968-05-2 C39H40F2N2O6
Nicorandil N-Oxide Nicorandil N-Oxide 107833-98-7 C8H9N3O5
2-Phenyl-1-[4-(trifluoromethyl)phenyl]ethane 2-(Aminoethyl)oxime (Fluvoxamine Impurity) 2-Phenyl-1-[4-(trifluoromethyl)phenyl]ethane 2-(Aminoethyl)oxime (Fluvoxamine Impurity) 1217241-15-0 C17H17F3N2O
cis-Montelukast cis-Montelukast 774538-96-4 C35H36ClNO3S
(S)-(-)-Tolvaptan (S)-(-)-Tolvaptan 331947-44-5 C26H25ClN2O3
N-tert-Butoxycarbonyl Mirabegron N-tert-Butoxycarbonyl Mirabegron 1329485-55-3 C26H32N4O4S
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