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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
(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
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-(3,4-dihydroxyphenyl)-2-hydroxy-acetaldehyde 2-(3,4-dihydroxyphenyl)-2-hydroxy-acetaldehyde 13023-73-9 C8H8O4
3-Desmethyl Istradefylline 3-Desmethyl Istradefylline 155272-04-1 C19H22N4O4
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
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
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
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
Phosphine oxide, tris (2-methylphenyl)- Phosphine oxide, tris (2-methylphenyl)- 6163-63-9 C21H21OP
2-(7-Methoxynaphthalen-1-yl)acetamide 2-(7-Methoxynaphthalen-1-yl)acetamide 138113-07-2 C13H13NO2
2-(7-Methoxynaphthalen-1-yl)acetamide 2-(7-Methoxynaphthalen-1-yl)acetamide 138113-07-2 C13H13NO2
2-(2-carboxyethyl)-1-[(3,4-dimethoxyphenyl)methyl]-,1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-isoquinolinium benzenesulfonate 2-(2-carboxyethyl)-1-[(3,4-dimethoxyphenyl)methyl]-,1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-isoquinolinium benzenesulfonate 1075727-06-8 C30H37NO9S
1616710-52-1 1616710-52-1 1616710-52-1 C27H34N2O6
6-HYDROXY ONDANSETRON 6-HYDROXY ONDANSETRON 110708-17-3 C18H19N3O2
Apixaban Impurity 22 Apixaban Impurity 22 1449510-64-8 C25H26ClN5O4
Cefdinir impurity TU mixture Cefdinir impurity TU mixture
Fotagliptin Impurity 1 Fotagliptin Impurity 1
Rocuronium bromide Impurity 7 Rocuronium bromide Impurity 7
Tofacitinib Impurity 69 Tofacitinib Impurity 69
Benzenamine, 3-(2-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)- Benzenamine, 3-(2-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)- 641571-06-4 C11H10F3N3
Ciprofloxacin EP Impurity E Ciprofloxacin EP Impurity E 879005-96-6 C16H20FN3O
ethyl 2-(3-cyano-4-propoxyphenyl)-4-methylthiazole-5- carboxylate ethyl 2-(3-cyano-4-propoxyphenyl)-4-methylthiazole-5- carboxylate C17H18N2O3S
(2S,5R,6S)-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid Diphenylmethyl Ester (2S,5R,6S)-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid Diphenylmethyl Ester 74189-25-6 C21H20BrNO3S
Trelagliptin Impurity 5 Trelagliptin Impurity 5 2087874-92-6 C22H24FN5O5
9H-Purin-6-amine, 9-beta-D-arabinofuranosyl-2-methoxy- 9H-Purin-6-amine, 9-beta-D-arabinofuranosyl-2-methoxy- 51742-84-8 C11H15N5O5
2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid 1-oxide 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid 1-oxide 2418591-42-9 C16H16N2O4S
Ropivacaine impurity Ropivacaine impurity 1786841-18-6 C12H14N2O3
PREDNICARBATE RELATED COMPOUND A (20 MG) (1,2-DIHYDROPREDNICARBATE) PREDNICARBATE RELATED COMPOUND A (20 MG) (1,2-DIHYDROPREDNICARBATE) 671225-26-6 C27H38O8
OPEN RING AZTREONAM OPEN RING AZTREONAM 87500-74-1 C13H19N5O9S2
Androst-2-en-17-one, (5β)- Androst-2-en-17-one, (5β)- 82467-84-3 C19H28O
(2Z)-2,3-Dehydroxy Atorvastatin (>90% Z) (2Z)-2,3-Dehydroxy Atorvastatin (>90% Z) 1191901-60-6 C33H33FN2O4
(6α,11β)-11,21-Dihydroxy-6-methyl-pregna-1,4-diene-3,20-dione (6α,11β)-11,21-Dihydroxy-6-methyl-pregna-1,4-diene-3,20-dione 103744-18-9 C22H30O4
2,5-Thiazolylmethyl Diacarbonate 2,5-Thiazolylmethyl Diacarbonate 144142-33-6 C28H30N4O5S2
4-(2-Chloroethyl)-N-methoxy-N,α,α-trimethyl-benzeneacetamide 4-(2-Chloroethyl)-N-methoxy-N,α,α-trimethyl-benzeneacetamide 1638785-17-7 C14H20ClNO2
Cefuroxime Impurity A Double-Bond Shift Impurity Cefuroxime Impurity A Double-Bond Shift Impurity
4-(difluoromethoxy)-N1-((3,4-dimethoxypyridin-2-yl)methyl)benzene-1,2-diamine 4-(difluoromethoxy)-N1-((3,4-dimethoxypyridin-2-yl)methyl)benzene-1,2-diamine 2641896-99-1 C15H17F2N3O3
Peramivir Impurity 21 Peramivir Impurity 21
Dapagliflozin Impurity 165 Dapagliflozin Impurity 165 342043-51-0 C18H18O4
3'-Desethoxy Drotaverine Hydrochloride 3'-Desethoxy Drotaverine Hydrochloride 85475-87-2 C22H28ClNO4
(S)-dimethyl 2-(4-(4-oxobutyl)benzamido)pentanedioate (S)-dimethyl 2-(4-(4-oxobutyl)benzamido)pentanedioate 1081974-98-2 C18H23NO6
Peramivir Impurity 38 Peramivir Impurity 38
2-O-cinnamoyl-beta-D-glucose 2-O-cinnamoyl-beta-D-glucose
(3S)-3-((S)-1-oxo-3a,4,5,6-tetrahydro-1H-benzo[de]isoquinolin-2(3H)-yl)quinuclidine 1-oxide (3S)-3-((S)-1-oxo-3a,4,5,6-tetrahydro-1H-benzo[de]isoquinolin-2(3H)-yl)quinuclidine 1-oxide
2-(4-hydroxy-1-methyl-7-phenoxy-5,6,7,8-tetrahydroisoquinoline-3-carboxamido)acetic acid 2-(4-hydroxy-1-methyl-7-phenoxy-5,6,7,8-tetrahydroisoquinoline-3-carboxamido)acetic acid
1,2,4-Triazolo[4,3-a]pyrazine, 7-[3-amino-1-oxo-4-(2,4,5-trifluorophenyl)-2-butenyl]-5,6,7,8-tetrahydro- 3-(trifluoromethyl)- 1,2,4-Triazolo[4,3-a]pyrazine, 7-[3-amino-1-oxo-4-(2,4,5-trifluorophenyl)-2-butenyl]-5,6,7,8-tetrahydro- 3-(trifluoromethyl)- 847445-81-2 C16H13F6N5O
4-Difluoromethoxy-2-nitro-aniline 4-Difluoromethoxy-2-nitro-aniline 97963-76-3 C7H6F2N2O3
rac Des(isopropylaMino) Acebutolol Diol rac Des(isopropylaMino) Acebutolol Diol 96480-91-0 C15H21NO5
(17α)-17-Hydroxy-3-oxo-19-norpregna-5(10),9(11)-diene-21-nitrile (17α)-17-Hydroxy-3-oxo-19-norpregna-5(10),9(11)-diene-21-nitrile 106111-42-6 C20H25NO2
(3S)-N-[[(1S)-1,2,3,4-Tetrahydro-1-naphthalenyl]Methyl]-1-azabicyclo[2.2.2]octan-3-aMine (3S)-N-[[(1S)-1,2,3,4-Tetrahydro-1-naphthalenyl]Methyl]-1-azabicyclo[2.2.2]octan-3-aMine 177793-80-5 C18H26N2
4-(4-Fluorophenyl)-1-Methyl- 4-(4-Fluorophenyl)-1-Methyl- 1012886-75-7 C12H15ClFN
5'(S)-Hydroxy SiMvastatin DISCONTINUED 5'(S)-Hydroxy SiMvastatin DISCONTINUED 149949-05-3 C25H38O6
5'-Epi-LaMivudine 5'-Epi-LaMivudine 136846-20-3 C8H11N3O3S
N-ForMyl-D-ribofuranosyl-3-guanylurea (α/β-Mixture) N-ForMyl-D-ribofuranosyl-3-guanylurea (α/β-Mixture) 686299-20-7 C8H14N4O6
SiMvastatin 4'-Methyl Ether SiMvastatin 4'-Methyl Ether 864357-88-0 C26H40O5
(2S,3S,5S)-5-(tert-Butoxycarbonylamino)-2-(N-5-thiazolylmethoxycarbonyl)amino-1,6-diphenyl-3-hydroxyhexane (2S,3S,5S)-5-(tert-Butoxycarbonylamino)-2-(N-5-thiazolylmethoxycarbonyl)amino-1,6-diphenyl-3-hydroxyhexane 162849-95-8 C28H35N3O5S
1-[3-(Benzoyloxy)propyl]-2,3-dihydro-5-[(2R)-2-[[2-[2-(2,2,2-trifluoroethoxy)phenoxy]ethyl]amino]propyl]-1H-indole-7-carbonitrile 1-[3-(Benzoyloxy)propyl]-2,3-dihydro-5-[(2R)-2-[[2-[2-(2,2,2-trifluoroethoxy)phenoxy]ethyl]amino]propyl]-1H-indole-7-carbonitrile 885340-11-4 C32H34F3N3O4
4-DesMethoxy-4-broMo TriMethopriM 4-DesMethoxy-4-broMo TriMethopriM 16285-82-8 C13H15BrN4O2
Diaquo[(1R,2R)-1,2-cyclohexanediaMine]platinuM DiMer Dinitrate Diaquo[(1R,2R)-1,2-cyclohexanediaMine]platinuM DiMer Dinitrate 82398-34-3 C12H24N5O5Pt2+
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