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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
4-((5,6-dimethoxy-1H-inden-2-yl)methyl)piperidine 4-((5,6-dimethoxy-1H-inden-2-yl)methyl)piperidine 1026443-48-0 C17H23NO2
epipinoresinol-4'-O-β-D-glucoside epipinoresinol-4'-O-β-D-glucoside 24404-49-7 C26H32O11
Celecoxib Impurity Celecoxib Impurity 170570-09-9 C18H16F3N3O2S
Indacaterol Impurity 7 Indacaterol Impurity 7 1403389-05-8 C24H30N2O3
tert-butyl 4-(6-((6-acetyl-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate tert-butyl 4-(6-((6-acetyl-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate 1883672-48-7 C29H38ClN7O4
1-cyclopropyl-7-fluoro-6,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 1-cyclopropyl-7-fluoro-6,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid C15H14FNO5
cis-cyclo(Pro-Pro) cis-cyclo(Pro-Pro) 19943-27-2 C10H14N2O2
Ropivacaine-cycle Ropivacaine-cycle 1945965-95-6 C17H24N2O
4-(5-methyl-4-phenylisoxazol-3-yl)benzenesulfonamide 4-(5-methyl-4-phenylisoxazol-3-yl)benzenesulfonamide 181696-12-8 C16H14N2O3S
Bupivacaine Impurity Bupivacaine Impurity 2125995-27-7 C18H29ClN2O
Brexpiprazole Impurity Brexpiprazole Impurity 2059954-32-2 C17H21Cl2NO2
BDJS-SH 2 BDJS-SH 2 36585-31-6 C12H18N2O2
Acyclovir Impurity Q Acyclovir Impurity Q
Ampicillin EP Impurity M Ampicillin EP Impurity M 114977-84-3 C48H57N9O12S3
Aprepitant Impurity 12 Aprepitant Impurity 12 172673-23-3 C23H21F7N4O4
Aprepitant Impurity 18 Aprepitant Impurity 18
Blonanserin impurity D Blonanserin impurity D
Captopril impurity 3 Captopril impurity 3
Empagliflozin Impurity 18 Empagliflozin Impurity 18
Empagliflozin Impurity 24 Empagliflozin Impurity 24
FeBuxostat impurity 31 FeBuxostat impurity 31
Formoterol Fumarate Dihydrate EP Impurity I Formoterol Fumarate Dihydrate EP Impurity I 532414-36-1 C19H24N2O4
Fosaprepitant Impurity 3 Fosaprepitant Impurity 3
Fosfomycin Trometamol EP Impurity D Fosfomycin Trometamol EP Impurity D 1262243-12-8 C10H25NO11P2
Isavuconazole Impurity 17 Isavuconazole Impurity 17
Isavuconazole Impurity 5 Isavuconazole Impurity 5
Moxifloxacin Impurity 21 Moxifloxacin Impurity 21
Mupirocin EP Impurity A Mupirocin EP Impurity A C26H44O9
Nifendipine Impurity G Nifendipine Impurity G 74378-10-2 C15H14N2O6
Olaparib Impurity 5 Olaparib Impurity 5
Plerixafor Impurity 5 Plerixafor Impurity 5
Posaconazole Impurity 30 Posaconazole Impurity 30
Posaconazole Impurity 35 Posaconazole Impurity 35 1370190-85-4 C14H13F2N3O
Posaconazole Impurity 51 Posaconazole Impurity 51 357189-94-7 C37H40F2N8O5
Posaconazole Impurity 59 Posaconazole Impurity 59
Ramosetron Impurity 13 Ramosetron Impurity 13 183613-77-6 C17H13N3O
Sitafloxacin Impurity 2 Sitafloxacin Impurity 2
Sitagliptin Impurity 10 Sitagliptin Impurity 10 1253056-01-7 C16H14F6N4O2
SofosBuvir Impurity 18 SofosBuvir Impurity 18
sofosBuvir Impurity 35 sofosBuvir Impurity 35
SofosBuvir Impurity 51 SofosBuvir Impurity 51
SofosBuvir Impurity 58 SofosBuvir Impurity 58
Sulbactam EP Impurity G Sulbactam EP Impurity G
Ticagrelor impurity 21 Ticagrelor impurity 21
Tirofiban Impurity 13 Tirofiban Impurity 13 C27H45N3O3
Tofacitinib impurity U Tofacitinib impurity U
Vortioxetine impurity S Vortioxetine impurity S 1815608-51-5 C18H22N2S
Linagliptin N-Acetyl Impurity Linagliptin N-Acetyl Impurity 1803079-49-3 C27H30N8O3
(1R,3R)-1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid (1R,3R)-1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid 474668-76-3 C19H16N2O4
Lidocaine Impurity Lidocaine Impurity 70336-49-1 C20H22N2O2
(E)-2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]but-2-enamide (E)-2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]but-2-enamide 214782-56-6 C12H9F3N2O2
Amoxicillin Impurity O Amoxicillin Impurity O C16H19N3O5S
Ampicillin Impurity R Ampicillin Impurity R
Spectinomycin Impurity C Spectinomycin Impurity C
(2S,4S)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic acid (2S,4S)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic acid 1012341-52-4 C23H29NO4
Ethyl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-2-methyl-4-(2,5-dioxopyrrolidin-1-yl)butanoate Ethyl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-2-methyl-4-(2,5-dioxopyrrolidin-1-yl)butanoate 1038924-97-8 C24H27NO4
DONEPEZIL IMP DONEPEZIL IMP 923571-16-8 C24H22ClNO4
Parecoxib Impurity N Parecoxib Impurity N
5-[bis-(2-Chloroethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester 5-[bis-(2-Chloroethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester 87475-54-5 C18H25Cl2N3O2
6-Hydroxykaempferol 3-Rutinoside -6-glucoside 6-Hydroxykaempferol 3-Rutinoside -6-glucoside 145134-63-0 C33H40O21
(R)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline (R)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline 85-63-2 C21H27NO4
Linagliptin Impurity P Linagliptin Impurity P
Linagliptin Impurity U Linagliptin Impurity U
(R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzoic acid (R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzoic acid 1917324-15-2 C18H21FN4O4
N1,N4-bis((R)-1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)succinamide N1,N4-bis((R)-1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)succinamide C40H42F2N10O6
ethyl ((1R,3aR,4aR,6S,8aR,9S,9aS)-9-((E)-2-(5-(3-fluorophenyl)pyridin-2-yl)vinyl)-1-methyl-3-oxododecahydronaphtho[2,3-c]furan-6-yl)carbamate ethyl ((1R,3aR,4aR,6S,8aR,9S,9aS)-9-((E)-2-(5-(3-fluorophenyl)pyridin-2-yl)vinyl)-1-methyl-3-oxododecahydronaphtho[2,3-c]furan-6-yl)carbamate 618385-10-7 C29H33FN2O4
(2R)-2-deoxy-2-fluoro-2-methyl-α/β-D-erythro-pentofuranosyl chloride-3,5-dibenzoate (2R)-2-deoxy-2-fluoro-2-methyl-α/β-D-erythro-pentofuranosyl chloride-3,5-dibenzoate 1621160-31-3 C20H18ClFO5
Apremilast Impurity F Apremilast Impurity F
Etoricoxib Impurity 17 Etoricoxib Impurity 17
Ibrutinib Impurity 3 Ibrutinib Impurity 3 1226872-27-0 C25H26N6O4
Imatinib Impurity 2 Imatinib Impurity 2 1384131-91-2 C7H11NO
Mirabegron M5 (YM-538852) Mirabegron M5 (YM-538852) 1365244-63-8 C18H22N2O2
Sofosbuvir Impurity 6 Sofosbuvir Impurity 6
Vonoprazan Impurity 2 Vonoprazan Impurity 2 881733-36-4 C17H16FN3O2S
Atomoxetine EP impurity A Atomoxetine EP impurity A 56161-70-7 C16H19NO
Cinacalcet Impurity 21 Cinacalcet Impurity 21
Dasatinib Impurity D Dasatinib Impurity D
Doxofylline Impurity 1 Doxofylline Impurity 1 1429636-74-7 C10H16N4O3
Propofol Impurity Propofol Impurity 2095678-97-8 C16H24O3
Sitagliptin EP Impurity B Sitagliptin EP Impurity B 1345822-87-8 C16H19F5N5O5P
Amifostine Impurity 2 Amifostine Impurity 2
Brexpiprazole Impurity Brexpiprazole Impurity 2138169-93-2 C41H47N5O2S2
Cefoxitin impurity EF Cefoxitin impurity EF
Tenofovir Impurity 38 Tenofovir Impurity 38 161760-09-4 C8H11O6PS
N-(4-methyl-3-(3-(4-((4-methylpiperazin-1-yl)methyl)benzoyl)guanidino)phenyl)-4-(4-methylpiperazin-1-yl)benzamide N-(4-methyl-3-(3-(4-((4-methylpiperazin-1-yl)methyl)benzoyl)guanidino)phenyl)-4-(4-methylpiperazin-1-yl)benzamide C33H42N8O2
Apremilast Apremilast 1384440-16-7 C19H20N2O6S
XMUJPIDSOJTMMS-VTBMCCKRSA-N XMUJPIDSOJTMMS-VTBMCCKRSA-N 212505-49-2 C21H30O3
XLMHAABXFLIUNQ-UHFFFAOYSA-N XLMHAABXFLIUNQ-UHFFFAOYSA-N 368451-15-4 C24H26O3
NMEICKDXQPVPKK-UHFFFAOYSA-N NMEICKDXQPVPKK-UHFFFAOYSA-N 120244-82-8 C16H19ClN2O
4-Methylpiperazine-1-carbonyl chloride 4-Methylpiperazine-1-carbonyl chloride 39539-66-7 C6H11ClN2O
Epoxy Exemestane (6-Beta Isomer) Epoxy Exemestane (6-Beta Isomer) 152764-31-3 C20H24O3
AFTMPFJWAIDLME-QWHCGFSZSA-N AFTMPFJWAIDLME-QWHCGFSZSA-N 1808087-53-7 C15H19N3O3S
6-Cyclopropyl-10-fluorobenzo[k]phenanthridine 6-Cyclopropyl-10-fluorobenzo[k]phenanthridine 1187966-95-5 C20H14FN
4-[2-fluoro-4-[2-(methylcarbamoyl)pyridin-4-yl]oxyanilino]-N-methylpyridine-2-carboxamide 4-[2-fluoro-4-[2-(methylcarbamoyl)pyridin-4-yl]oxyanilino]-N-methylpyridine-2-carboxamide 1855006-12-0 C20H18FN5O3
2,2'-((piperazine-1,4-disulfonyl)bis(2-ethoxy-5,1-phenylene))bis(5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(3H)-one) 2,2'-((piperazine-1,4-disulfonyl)bis(2-ethoxy-5,1-phenylene))bis(5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(3H)-one) 1255919-03-9 C38H46N10O8S2
Bortezomib Impurity P Bortezomib Impurity P
Esmolol impurity A Esmolol impurity A
(5-(4-fluorophenyl)thiophen-2-yl)(5-iodo-2-methylphenyl)methanol (5-(4-fluorophenyl)thiophen-2-yl)(5-iodo-2-methylphenyl)methanol 1818268-45-9 C18H14FIOS
2-propyl-1H-indene-1,3(2H)-dione 2-propyl-1H-indene-1,3(2H)-dione 14570-43-5 C12H12O2
GLORIOSINE GLORIOSINE 7411-12-3 C21H23NO6
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