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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Miconazole Impurity G(EP) Miconazole Impurity G(EP) 1370335-40-2 C18H14Cl4N2O
2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one 2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one
2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 52549-22-1 C15H11NO3
1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1289559-76-7 C6H6ClFN2O
Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine 56161-71-8 C17H18F3NO
(Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine (Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine
Ceftriaxone sodium impurity 09 Ceftriaxone sodium impurity 09
Cefradine Impurity 8 Cefradine Impurity 8 30959-67-2 C16H19N3O4S
Dobutamine Impurity 3 Dobutamine Impurity 3 334947-75-0 C19H25NO3
Anastrozole Impurity 19 Anastrozole Impurity 19 1301724-97-9 C19H21N3O2
Biotin Impurity Biotin Impurity 171232-73-8 C19H18N2O2S
PANTOPRAZOLE N-OXIDE PANTOPRAZOLE N-OXIDE 953787-60-5 C16H15F2N3O5S
DEHYDROARIPIPRAZOLE, HYDROCHLORIDE DEHYDROARIPIPRAZOLE, HYDROCHLORIDE 1008531-60-9 C23H26Cl3N3O2
N-(3-GUANIDINO-4-METHYLPHENYL)-4-(METHYLPIPERAZINE-1-YL-METHYL)BENZAMIDE N-(3-GUANIDINO-4-METHYLPHENYL)-4-(METHYLPIPERAZINE-1-YL-METHYL)BENZAMIDE 581076-65-5 C21H28N6O
Tirofiban-d9 Hydrochloride Tirofiban-d9 Hydrochloride 1331911-68-2 C22H37ClN2O5S
2-Desisopropyl-2-phenyl Repaglinide 2-Desisopropyl-2-phenyl Repaglinide 107362-12-9 C30H34N2O4
2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 114444-10-9 C14H9ClN2O
BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] 55453-89-9 C16H14O5
Ipragliflozin Impurity 5 Ipragliflozin Impurity 5
Alectinib Impurity Alectinib Impurity 1256584-83-4 C26H25N3O2
Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib 2223677-58-3 C22H20ClFN4O4
Ibrutinib Impurity 18 Ibrutinib Impurity 18 1881246-01-0 C16H12N4O
Vitamin B1 Impurity 6 Vitamin B1 Impurity 6 C12H17ClN4OS
5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) 5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) C20H27NO6
2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2316733-82-9 C14H12F2O2
951313-25-0 951313-25-0 951313-25-0 C25H33N3O6
nicergoline impurity N nicergoline impurity N
Clopidogrel Impurity 50 Clopidogrel Impurity 50 C15H14ClNO2S
PraMipexole IMpurity Z1/Z2 PraMipexole IMpurity Z1/Z2
trans-Ibuprofen Impurity G trans-Ibuprofen Impurity G C13H18O2
Vonoprazan Impurity 15 Vonoprazan Impurity 15
Esomeprazole Impurity 6 Esomeprazole Impurity 6
Erlotinib Impurity 22 Erlotinib Impurity 22
Teneligliptin Impurity 1 Teneligliptin Impurity 1
Erlotinib Hydrochloride iMpurity 51 Erlotinib Hydrochloride iMpurity 51
(S)-10-(1-aminocyclopropyl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid formic acid (S)-10-(1-aminocyclopropyl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid formic acid C17H18N2O6
1H-Imidazole-1-ethanol, α-(chloromethyl)-5-nitro- 1H-Imidazole-1-ethanol, α-(chloromethyl)-5-nitro- 116989-52-7 C6H8ClN3O3
4-Pyridinemethanol, 3-hydroxy-2,5-dimethyl-, hydrochloride (1:1) 4-Pyridinemethanol, 3-hydroxy-2,5-dimethyl-, hydrochloride (1:1) 875-26-3 C8H11NO2.ClH
Afatinib ImpurityOYQ Afatinib ImpurityOYQ
Androst-3-en-17-one,(5) Androst-3-en-17-one,(5) 14935-81-0 C19H28O
Landiolol impurity X Landiolol impurity X
2-((4-(3-aminopiperidin-1-yl) 2-((4-(3-aminopiperidin-1-yl)
Rosuvastatin Impurity 111 Rosuvastatin Impurity 111
Metoprolol IMpurity V Metoprolol IMpurity V C15H25NO3
Teneligliptin Impurity 12 Teneligliptin Impurity 12
Nicergoline EP Impurity E Nicergoline EP Impurity E
Hexanoic acid, 3-[(hydroxyamino)methyl]-5-methyl-, (3S)- Hexanoic acid, 3-[(hydroxyamino)methyl]-5-methyl-, (3S)- 2349671-57-2 C8H17NO3
α-D-Glucopyranoside, methyl 1-C-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-, 2,3,4,6-tetraacetate α-D-Glucopyranoside, methyl 1-C-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-, 2,3,4,6-tetraacetate 714269-58-6 C30H35ClO11
Caspofungin Impurity H Caspofungin Impurity H
(trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine hydrochloride (trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine hydrochloride 127017-41-8 C21H25NO4.ClH
Ezetimibe Impurity 76 Ezetimibe Impurity 76 1185883-46-8 C39H44F2N2O5Si
Cefmetazole impurity 9/(6R-cis)-7-[[[(Cyanomethyl)thio]acetyl]amino]-3-(hydroxymethyl)-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid Cefmetazole impurity 9/(6R-cis)-7-[[[(Cyanomethyl)thio]acetyl]amino]-3-(hydroxymethyl)-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid 70953-19-4 C13H15N3O6S2
((cis)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate ((cis)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate C20H24FNO3S
Elagolix Sodium impurity1 Elagolix Sodium impurity1
Nicorandil Impurity E Nicorandil Impurity E
Prednicarbate Impurity G Prednicarbate Impurity G
Anastrozole iMpurity F Anastrozole iMpurity F
Ondansetron IMpurity 6 Ondansetron IMpurity 6
MeropeneM iMpurity 6 MeropeneM iMpurity 6
Macitentan Impurity 33 Macitentan Impurity 33 2089065-77-8 C28H32Br2N8O6S2
Cefminox Impurity 5 Cefminox Impurity 5
Alogliptin Impurity 20 Alogliptin Impurity 20
Cyclobenzaprine Impurity 3 Cyclobenzaprine Impurity 3 24167-44-0 C15H11BrO
Emtricitabine Impurity 16 Emtricitabine Impurity 16 1160303-44-5 C8H10FN3O4S
Etoricoxib Impurity 44 Etoricoxib Impurity 44
Irbesartan Impurity 15 Irbesartan Impurity 15 C25H28N6O
Linagliptin Impurity 54 Linagliptin Impurity 54
Ornidazole Impurity 13 Ornidazole Impurity 13 1685275-23-3 C7H10N3O6P.Na
Oseltamivir Impurity 44 Oseltamivir Impurity 44
Oseltamivir Impurity 51 Oseltamivir Impurity 51
Palbociclib Impurity 47 Palbociclib Impurity 47
Rosuvastatin Impurity 98 Rosuvastatin Impurity 98
Sildenafil Impurity 38 Sildenafil Impurity 38 C22H30N6O4S
Tenofovir Impurity 70 Tenofovir Impurity 70
Ticagrelor Impurity 122 Ticagrelor Impurity 122
Tofacitinib Impurity 111 Tofacitinib Impurity 111 2374700-37-3 C27H31N5O2S
Ibrutinib Impurity 37 Ibrutinib Impurity 37 330793-49-2 C10H13IN6
(S)-((6-(propylamino)-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)amino)methanol (S)-((6-(propylamino)-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)amino)methanol C11H19N3OS
(trans)-4-((6-amino-2,3-dibromobenzyl)amino)cyclohexanol (trans)-4-((6-amino-2,3-dibromobenzyl)amino)cyclohexanol C13H18Br2N2O
6-Benzoxazolecarboxylic acid, 2-(3,5-dichlorophenyl)-, methyl ester 6-Benzoxazolecarboxylic acid, 2-(3,5-dichlorophenyl)-, methyl ester 1395964-06-3 C15H9Cl2NO3
ERYTHROMYCIN IMPURITY N ERYTHROMYCIN IMPURITY N
Fesoterodine Impurity 12 Fesoterodine Impurity 12
Dexamethasone EP impurities D Dexamethasone EP impurities D
Palbociclib impurity LMAP Palbociclib impurity LMAP
(3R,3'R)-3,3'-((((S)-1-amino-1-oxobutan-2-yl)azanediyl)bis(methylene))dihexanoic acid (3R,3'R)-3,3'-((((S)-1-amino-1-oxobutan-2-yl)azanediyl)bis(methylene))dihexanoic acid C18H34N2O5
Acetaminophen EP Impurity L Acetaminophen EP Impurity L C8H9NO2
Anagrelide Impurity 2 HCl Anagrelide Impurity 2 HCl
(R)-4-(2-(benzyl(methyl)amino)-1-hydroxyethyl)benzene-1,2-diol (R)-4-(2-(benzyl(methyl)amino)-1-hydroxyethyl)benzene-1,2-diol 317351-40-9 C16H19NO3
N,N'-Bis(4-hydroxyphenyl)hydrazine N,N'-Bis(4-hydroxyphenyl)hydrazine 158905-63-6 C12H12N2O2
Droxidopa Impurity M Droxidopa Impurity M
Vigabatrin Impurity 2 Vigabatrin Impurity 2
Aripiprazole peroxide degradation Impurity (MW:464Da) Aripiprazole peroxide degradation Impurity (MW:464Da)
Zileuton Impurity (MW = 279.31 Da) Zileuton Impurity (MW = 279.31 Da)
3'-chloro-3'-deoxythymidine (zidovudine impurity) 3'-chloro-3'-deoxythymidine (zidovudine impurity)
Rivaroxaban Impurity 81 Rivaroxaban Impurity 81
Salbutamol Impurity 37 Salbutamol Impurity 37
Gadobutrol Impurity 21 Gadobutrol Impurity 21
Flucloxacillin sodium EP Impurity E Flucloxacillin sodium EP Impurity E
Pyrazole Pyrazole
Cephalomannine (Paclitaxel Impurity I) Cephalomannine (Paclitaxel Impurity I)
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