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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Ofloxacin/Levofloxacin Impurity A Ofloxacin/Levofloxacin Impurity A
Urapidil Impurity A Urapidil Impurity A
Tofacitinib Impurity I Tofacitinib Impurity I
N-(3-chloro-4-fluorophenyl)-6 ,7-dimethoxyquinazolin-4-amine N-(3-chloro-4-fluorophenyl)-6 ,7-dimethoxyquinazolin-4-amine 153437-78-6 C16H13ClFN3O2
Itopride Impurity C Itopride Impurity C 141996-97-6 C19H24N2O4
Mirabegron Impurity Mirabegron Impurity 1796931-48-0 C21H24N4O2S
34-Methylcyanocobalamin 34-Methylcyanocobalamin 38218-51-8 C64H90CoN14O14P
Empagliflozin Impurity D Empagliflozin Impurity D
Ipragliflozin Impurity 2 Ipragliflozin Impurity 2
Nicergoline EP impurity F Nicergoline EP impurity F
Mirabegron Impurity 4 Mirabegron Impurity 4
Bisoprolol EP Impurity D Bisoprolol EP Impurity D 1225195-71-0 C26H40N2O5
Febuxostat Descyano Impurity Febuxostat Descyano Impurity 1206550-99-3 C15H17NO3S
(5S,8R,9S,10S,13S,14S)-10,13-dimethyl-1,5,6,7,8,9,10,11,12,13,15,16-dodecahydro-4H-cyclopenta[a]phenanthren-17(14H)-one (5S,8R,9S,10S,13S,14S)-10,13-dimethyl-1,5,6,7,8,9,10,11,12,13,15,16-dodecahydro-4H-cyclopenta[a]phenanthren-17(14H)-one 14639-79-3 C19H28O
Cefuroxime Sodium Impurity Cefuroxime Sodium Impurity C16H16N4NaO8S
5-Chloro-6-[4-(ethoxycarbonyl)piperidino]-nicotinic acid 5-Chloro-6-[4-(ethoxycarbonyl)piperidino]-nicotinic acid 931395-73-2 C14H17ClN2O4
2-Bromo (S)-Carbidopa 2-Bromo (S)-Carbidopa 43197-33-7 C10H13BrN2O4
Eliglustat intermediate 3 Eliglustat intermediate 3 491833-26-2 C23H28N2O5
Allopurinol Related CoMpound F Allopurinol Related CoMpound F 321571-07-7 C12H14N4O4
N-[(n-butylaMino)carbonyl]-4-[(3-Methylphenyl)aMino]-3-pyridinesulfonaMide N-[(n-butylaMino)carbonyl]-4-[(3-Methylphenyl)aMino]-3-pyridinesulfonaMide 160972-33-8 C17H22N4O3S
(R)-N-DeMethyl Dapoxetine (R)-N-DeMethyl Dapoxetine 1202160-36-8 C20H21NO
14,15-Dehydro Budesonide 14,15-Dehydro Budesonide 131918-64-4 C25H32O6
2-(BenzylMethylaMino)-3',4'-dihydroxyacetophenone 2-(BenzylMethylaMino)-3',4'-dihydroxyacetophenone 36467-25-1 C16H17NO3
2'-O-(5'-Deoxy-β-D-ribofuranosyl) Capecitabine 2'-O-(5'-Deoxy-β-D-ribofuranosyl) Capecitabine 1262133-66-3 C20H30FN3O9
4-Defluoro-4-hydroxy Gefitinib 4-Defluoro-4-hydroxy Gefitinib 847949-50-2 C22H25ClN4O4
Desethyl Sildenafil Desethyl Sildenafil 139755-91-2 C20H26N6O4S
N-Desisopropyl-N-forMyl Bisoprolol N-Desisopropyl-N-forMyl Bisoprolol 1346602-59-2 C16H25NO5
N-DesMethyl Olopatadine N-DesMethyl Olopatadine 113835-92-0 C20H21NO3
10-Keto DextroMethorphan 10-Keto DextroMethorphan 57969-05-8 C18H23NO2
Aztreonam Impurity B Aztreonam Impurity B 102586-36-7 C13H19N5O6S
Atorvastatin Impurity 30 Atorvastatin Impurity 30 666714-64-3 C26H23FN2O
Olopatadine impurity Olopatadine impurity
Azilsartan Impurity Azilsartan Impurity 1863930-34-0 C23H23N3O3
Voriconazole Impurity 8 Voriconazole Impurity 8 239807-03-5 C16H14F3N5O
Caspofungin impurity 3 Caspofungin impurity 3
Plerixafor Impurity D Plerixafor Impurity D
Cefuroxime impurity 1 Cefuroxime impurity 1 C16H16N4O8S
Vonoprazan Impurity 9 Vonoprazan Impurity 9
Sitagliptin IMpurity 5 Sitagliptin IMpurity 5
Brexpiprazole Impurity3 Brexpiprazole Impurity3
Levetiracetam impurity 5 Levetiracetam impurity 5 1543300-90-8 C9H17NO4
Febuxostat Impurity B Febuxostat Impurity B
Sorafenib Impurity F Sorafenib Impurity F
Trelagliptin Impurity 1 Trelagliptin Impurity 1 1821400-07-0 C21H13ClF2N4O2
Vortioxetine Imp.J Vortioxetine Imp.J 2137588-68-0 C18H22N2S
4-amino-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 4-amino-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 1608459-56-8 C18H27N3O3
4,5-dichloro Rivaroxaban 4,5-dichloro Rivaroxaban 2305917-61-5 C25H28ClN3O6S
Solifenacin EP Impurity B Solifenacin EP Impurity B 1534326-81-2 C31H28N2O
Vildagliptin Impurity 6 Vildagliptin Impurity 6 1846606-31-2 C17H23N3O2
Flucloxacillin Impurity A Flucloxacillin Impurity A
Nicorandil Impurity 1 Nicorandil Impurity 1
Piperacillin Impurity 6 Piperacillin Impurity 6
Bosutinib Impurity 5 Bosutinib Impurity 5 1391063-17-4 C26H29Cl2N5O3
Afatinib Impurity 14 Afatinib Impurity 14
1-Propanol,3-[(1,1-dimethylethyl)amino]-2-[[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]-oxy]- 1-Propanol,3-[(1,1-dimethylethyl)amino]-2-[[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]-oxy]- 59697-06-2 C13H24N4O3S
Anagrelide impurity 4 Anagrelide impurity 4 1092352-99-2 C10H6Cl3N3O
rac Cetirizine N-Oxide > 70% by HPLC (Mixture of Diastereomers) rac Cetirizine N-Oxide > 70% by HPLC (Mixture of Diastereomers) 1076199-80-8 C21H25ClN2O4
(S)-N-Didemethyl Dapoxetine (S)-N-Didemethyl Dapoxetine 147199-40-4 C19H19NO
Hydroxy Flunarizine Hydroxy Flunarizine 87166-81-2 C26H26F2N2O
1-METHYL-4-NITRO-3-PROPYL-1H-PYRAZOLE-5-CARBOXYLIC ACID 1-METHYL-4-NITRO-3-PROPYL-1H-PYRAZOLE-5-CARBOXYLIC ACID 139756-00-6 C8H11N3O4
6-Hydroxy Nicorandil 6-Hydroxy Nicorandil 113743-17-2 C8H9N3O5
trans-Itraconazole trans-Itraconazole 252964-65-1 C35H38Cl2N8O4
N-(2-Pyridyl)oxamic Acid N-(2-Pyridyl)oxamic Acid 13120-39-3 C7H6N2O3
(trans)-4-Propyl-1-methyl-L-proline (trans)-4-Propyl-1-methyl-L-proline 13380-36-4 C9H17NO2
N-Nordextromethorphan N-Nordextromethorphan 1531-23-3 C17H23NO
(S,S,R,R)-Orlistat (S,S,R,R)-Orlistat 111466-62-7 C29H53NO5
17β-Carboxy-17-desoxy Dexamethasone 17β-Carboxy-17-desoxy Dexamethasone 75262-69-0 C21H27FO4
1-(dimethoxymethyl)-3-methoxybenzene 1-(dimethoxymethyl)-3-methoxybenzene 59276-28-7 C10H14O3
Benazepril impurity A Benazepril impurity A C24H28N2O5
3S,4R-4-[phenyl-1-methylpiperidinyl] methanol 3S,4R-4-[phenyl-1-methylpiperidinyl] methanol 176022-03-0 C13H19NO
2'-[(1H-Tetrazol-5-yl)biphenyl-4-yl]Methanol 2'-[(1H-Tetrazol-5-yl)biphenyl-4-yl]Methanol 160514-13-6 C14H12N4O
ent-Paroxol ent-Paroxol 389573-45-9 C13H18FNO
Ethyl α-Thioglucopyranoside Ethyl α-Thioglucopyranoside 13533-58-9 C8H16O5S
Febuxostat Acyl-β-D-glucuronide Febuxostat Acyl-β-D-glucuronide 1351692-92-6 C22H24N2O9S
Keto Bisoprolol Keto Bisoprolol 864544-37-6 C18H29NO5
Olopatadine Carbaldehyde DISCONTINUED Olopatadine Carbaldehyde DISCONTINUED 1376615-97-2 C21H23NO2
5-Chloro-1-methyl-4-nitroimidazole 5-Chloro-1-methyl-4-nitroimidazole C4H4ClN3O2
Nisoldipine Related Compound II Nisoldipine Related Compound II
5-Chloro-N1-Methylbenzene-1,2-diaMine 5-Chloro-N1-Methylbenzene-1,2-diaMine 84859-27-8 C7H9ClN2
(1'S,3'S,4'S)-Entecavir IsoMer (1'S,3'S,4'S)-Entecavir IsoMer 1367369-80-9 C12H15N5O3
Zolmitriptan Related Compound B (20 mg) ((S)-2-Amino-3-{3-[2-(dimethylamino)ethyl]-1H-indol-5-yl}propan-1-ol) Zolmitriptan Related Compound B (20 mg) ((S)-2-Amino-3-{3-[2-(dimethylamino)ethyl]-1H-indol-5-yl}propan-1-ol) 139264-69-0 C15H23N3O
1-BENZYL-N,4-DIMETHYLPIPERIDIN-3-AMINE DIHYDROCHLORIDE 1-BENZYL-N,4-DIMETHYLPIPERIDIN-3-AMINE DIHYDROCHLORIDE 384338-23-2 C14H22N2
(R,Z)-2-((R)-((Z)-2-(2-aMinothiazol-4-yl)-2-(hydroxyiMino)acetaMido)(carboxy)Methyl)-5-ethylidene-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid (R,Z)-2-((R)-((Z)-2-(2-aMinothiazol-4-yl)-2-(hydroxyiMino)acetaMido)(carboxy)Methyl)-5-ethylidene-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid 178422-39-4 C14H15N5O6S2
Acyclovir IMpurity C Acyclovir IMpurity C 91702-61-3 C8H11N5O3
Nicergoline-5-Chloro Analogue Nicergoline-5-Chloro Analogue 38536-28-6 C24H26ClN3O3
1-(3-aMino-5-(benzyloxy)-2-hydroxyphenyl)ethanone 1-(3-aMino-5-(benzyloxy)-2-hydroxyphenyl)ethanone 861841-90-9 C15H15NO3
(2RS)-2-Hydroxy-2-[4-(2-Methylpropyl)phenyl]propanoic Acid (2RS)-2-Hydroxy-2-[4-(2-Methylpropyl)phenyl]propanoic Acid C13H18O3
(3RS)-1,3-Bis[4-(2-Methylpropyl) phenyl]butan-1-one (3RS)-1,3-Bis[4-(2-Methylpropyl) phenyl]butan-1-one C24H32O
2-[4-(2-Methylpropyl)phenyl] ethanol 2-[4-(2-Methylpropyl)phenyl] ethanol 2143535-25-3 C24H32O
1-cyclopropyl-6-fluoro-8-hydroxy-4-oxo-7-((4aR,7aR)-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6(2H,7H,7aH)-yl)-1,4-dihydroquinoline-3-carboxylic acid hydrobroMide 1-cyclopropyl-6-fluoro-8-hydroxy-4-oxo-7-((4aR,7aR)-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6(2H,7H,7aH)-yl)-1,4-dihydroquinoline-3-carboxylic acid hydrobroMide 1292904-74-5 C20H23BrFN3O4
IMp. K (EP) IMp. K (EP) 40610-41-1 C13H17NO3
(Z)-Methyl 3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-2-oxo-2,3-dihydro-1H-benzo[d]iMidazole-4-carboxylate (Z)-Methyl 3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-2-oxo-2,3-dihydro-1H-benzo[d]iMidazole-4-carboxylate 1499167-72-4 C23H20N4O4
4-(4-fluorobenzoyl)-3-(hydroxyMethyl)benzonitrile 4-(4-fluorobenzoyl)-3-(hydroxyMethyl)benzonitrile 260371-16-2 C15H10FNO2
ATV-FX1 sodiuM salt ATV-FX1 sodiuM salt 1315629-79-8 C33H34FN2NaO7
Montelukast Impurity H Montelukast Impurity H 851755-56-1 C34H32ClNO4S
SalMeterol EP IMpurity F SalMeterol EP IMpurity F 1391054-40-2 C25H37NO3
[6-Hydroxy-2-(4-hydroxyphenyl)benzo[b]thiophen-7-yl] [6-Hydroxy-2-(4-hydroxyphenyl)benzo[b]thiophen-7-yl] 1391054-73-1 C28H27NO4S
(R)-α-Methyl-N-[3-[3-(trifluoroMethyl)phenyl]Methyl]-1-naphthaleneMethaneaMine Hydrochloride (R)-α-Methyl-N-[3-[3-(trifluoroMethyl)phenyl]Methyl]-1-naphthaleneMethaneaMine Hydrochloride 1229225-42-6 C20H19ClF3N
3(S)-Hydroperoxy Simvastatin 3(S)-Hydroperoxy Simvastatin 1092716-44-3 C25H38O7
2(RS)-4-Methyl-1-(3-Methylpyridin-2-yl)-2-phenylpiperazine 2(RS)-4-Methyl-1-(3-Methylpyridin-2-yl)-2-phenylpiperazine 191546-94-8 C17H21N3
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