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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Olodaterol Impurity 23 Olodaterol Impurity 23
Miglitol Isomer impurities C Miglitol Isomer impurities C
Alpha-D-Methylglucoside Alpha-D-Methylglucoside
4-Desacetyl Vincristine 4-Desacetyl Vincristine 3704-01-6 C44H54N4O9
Relugolix Impurity 91 Relugolix Impurity 91
D,L N-Desmethylvenlafaxine D,L N-Desmethylvenlafaxine 149289-30-5 C16H25NO2
Bupivacaine Impurity Bupivacaine Impurity 780736-98-3 C14H20N2O
rel-(4aR,7aR)-6-Benzyloctahydro-1H-pyrrolo[3,4-b]pyridine rel-(4aR,7aR)-6-Benzyloctahydro-1H-pyrrolo[3,4-b]pyridine 161594-54-3 C14H20N2
1,2-bis(4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)ethane 1,2-bis(4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)ethane 51299-16-2 C24H28F6N4
(R)-N-(1-(7,8-dihydronaphthalen-1-yl)ethyl)-3-(3-(trifluoromethyl)phenyl)propan-1-amine (R)-N-(1-(7,8-dihydronaphthalen-1-yl)ethyl)-3-(3-(trifluoromethyl)phenyl)propan-1-amine 802918-35-0 C22H24F3N
Demiditraz racemate Demiditraz racemate 944263-08-5 C13H16N2
Ropivacaine-iPr Ropivacaine-iPr 175888-75-2 C17H26N2O
Demiditraz IMpurity Demiditraz IMpurity 944267-48-5 C19H18N2O
Apremilast impurity 18 Apremilast impurity 18 1407140-51-5 C20H32N2O6S
Betamethasone EP Impurity F Betamethasone EP Impurity F 330157-04-5 C22H28O4
Capecitabine Impurity 8 Capecitabine Impurity 8
Carfilzomib Impurity D Carfilzomib Impurity D
Cefodizime Impurity 4 Cefodizime Impurity 4
PraMipexole IMpurity V (PraMipexole IMpurity Z) PraMipexole IMpurity V (PraMipexole IMpurity Z)
Prasugrel Acetyl IMpurity Prasugrel Acetyl IMpurity 1443034-67-0 C18H18FNO3S
Propofol IMpurity G Propofol IMpurity G
SalMeterol IMpurity A SalMeterol IMpurity A C25H37NO4
Sitagliptin Defuoro IMpurity 3 Sitagliptin Defuoro IMpurity 3 851307-12-5 C15H19F2NO4
Sitagliptin N-Boc IMpurity Sitagliptin N-Boc IMpurity 486460-23-5 C21H23F6N5O3
SulbactaM IMpurity D SulbactaM IMpurity D
Valsartan N2-Trityl IMpurity Valsartan N2-Trityl IMpurity
Vardenafil IMpurity 3 Vardenafil IMpurity 3 1255919-01-7 C26H30N6O4S
Montelukast Cyclopropaneacetonitrile Montelukast Cyclopropaneacetonitrile 866923-62-8 C35H35ClN2OS
(3R,4R,5R,6S)-2-(acetoxyMethyl)-6-(4-chloro-3-(4-ethoxybenzyl)phenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate (3R,4R,5R,6S)-2-(acetoxyMethyl)-6-(4-chloro-3-(4-ethoxybenzyl)phenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate 461432-24-6 C22H27ClO7
Ezetimibe Impurity Ezetimibe Impurity 1510820-22-0 C24H23F2NO2
10,13-bissidechainpaclitaxel 10,13-bissidechainpaclitaxel
Cefradine impurity 5 Cefradine impurity 5 1379292-16-6 C10H17NO2
Clopidogrel Impurity 13 Clopidogrel Impurity 13 2173294-69-2 C16H16ClNO5S2
DecitaBine Impurity 12 DecitaBine Impurity 12
Erlotinib Impurity 28 Erlotinib Impurity 28
Fosaprepitant Impurity 12 Fosaprepitant Impurity 12 172673-19-7 C23H22F7N4O6P
Ibuprofen Impurity 2 Ibuprofen Impurity 2 C13H18O2
Imatinib Impurity 9 Imatinib Impurity 9
Isavuconazole Impurity 22 Isavuconazole Impurity 22
Isavuconazole Impurity 28 Isavuconazole Impurity 28
Levothyroxine Impurity 16 Levothyroxine Impurity 16 909279-46-5 C15H11ClI3NO4
Linagliptin Impurity 42 Linagliptin Impurity 42
PalBociclib Impurity 25 PalBociclib Impurity 25
Posaconazole Impurity 13 Posaconazole Impurity 13 357189-98-1 C37H40F2N8O6
Posaconazole Impurity 25 Posaconazole Impurity 25 1042398-26-4 C16H19F2IO3
Posaconazole Impurity 42 Posaconazole Impurity 42 357189-96-9 C36H40F2N8O5
Posaconazole Impurity 65 Posaconazole Impurity 65
Pramipexole Dimer Impurity (Mixture of Diastereomers) Pramipexole Dimer Impurity (Mixture of Diastereomers) 1147937-31-2 C13H23N3S
Sitafloxacin Impurity 1 Sitafloxacin Impurity 1
Sitagliptin Impurity 25 Sitagliptin Impurity 25
sofosBuvir impurity 47 sofosBuvir impurity 47
SofosBuvir Impurity 64 SofosBuvir Impurity 64
Tofacitinib Impurity W Tofacitinib Impurity W
Trelagliptin Impurity 21 Trelagliptin Impurity 21
4'-Hydroxy TorseMide 4'-Hydroxy TorseMide 99300-67-1 C16H20N4O4S
Hydroxyzine Acetic Acid Dihydrochloride Hydroxyzine Acetic Acid Dihydrochloride 83881-56-5 C23H29ClN2O4
(S)-Duloxetine SuccinaMide (S)-Duloxetine SuccinaMide 199191-66-7 C22H23NO4S
4-Acetyl Rhein 4-Acetyl Rhein 875535-36-7 C17H10O7
1-(2,6-dichlorophenyl)piperazine 1-(2,6-dichlorophenyl)piperazine 63386-61-8 C10H12Cl2N2
Ropivacaine N-Oxide Ropivacaine N-Oxide 1391053-59-0 C17H26N2O2
Istradefylline Impurity A Istradefylline Impurity A
(3R,4S)-1-benzyl-N,4-diMethylpiperidin-3-aMine dihydrochloride (3R,4S)-1-benzyl-N,4-diMethylpiperidin-3-aMine dihydrochloride C14H24Cl2N2
2-(((3-Methyl-4-nitropyridin-2-yl)Methyl)sulfinyl)-1H- benzo[d]iMidazole 2-(((3-Methyl-4-nitropyridin-2-yl)Methyl)sulfinyl)-1H- benzo[d]iMidazole 142384-07-4 C14H12N4O3S
Valsartan Desvaleryl Impurity Valsartan Desvaleryl Impurity 676129-92-3 C19H21N5O2
Istradefylline iMpurity Istradefylline iMpurity
(E)-Olopatadine Hydrochloride (E)-Olopatadine Hydrochloride 949141-22-4 C21H24ClNO3
(3R,4R,5R)-3-(1-Ethylpropoxy)-4-hydroxy-5-[(Methylsulfonyl)oxy]-1-cyclohexene-1-carboxylic Acid Ethyl Ester (3R,4R,5R)-3-(1-Ethylpropoxy)-4-hydroxy-5-[(Methylsulfonyl)oxy]-1-cyclohexene-1-carboxylic Acid Ethyl Ester 204254-92-2 C15H26O7S
(R)-α-[(2,2-DiMethyl-1-oxopropyl)aMino]-4-hydroxybenzeneacetic Acid (R)-α-[(2,2-DiMethyl-1-oxopropyl)aMino]-4-hydroxybenzeneacetic Acid 205826-86-4 C13H17NO4
8-Hydroxy Pitavastatin 8-Hydroxy Pitavastatin 224320-09-6 C25H24FNO5
α-Decitabine α-Decitabine 22432-95-7 C8H12N4O4
Aloin Peracetate Aloin Peracetate 64951-96-8 C37H38O17
L-Alanine, N-[(2,3,4,5,6-pentafluorophenoxy)phenoxyphosphinyl]-, 1-Methylethyl ester L-Alanine, N-[(2,3,4,5,6-pentafluorophenoxy)phenoxyphosphinyl]-, 1-Methylethyl ester 1256490-52-4 C18H17F5NO5P
Cefditoren iMpurity 2, Cefditoren open ring Cefditoren iMpurity 2, Cefditoren open ring
Ceftriaxone IMpurity C Ceftriaxone IMpurity C
Etoricoxib iMpurity 2 Etoricoxib iMpurity 2
Lorcaserin iMpurity D Lorcaserin iMpurity D 1030624-36-2 C11H14ClNO2
Ticagrelor IMpurity L (Mixture of DiastereoMers) Ticagrelor IMpurity L (Mixture of DiastereoMers)
α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester 783273-13-2 C18H19NO4S2
3H-4,7a-Methanocyclohept[3,3a]indeno[5,4-b]oxete Benzenepropanoic Acid Derivative 3H-4,7a-Methanocyclohept[3,3a]indeno[5,4-b]oxete Benzenepropanoic Acid Derivative 146139-03-9 C47H51NO14
Fluvastatin 3-Hydroxy-4,6-diene Fluvastatin 3-Hydroxy-4,6-diene 1207963-21-0 C24H24FNO3
Cyclosporine iMpurity Cyclosporine iMpurity
ThiaMine IMpurity ThiaMine IMpurity C12H17ClN4OS
CitalopraM IMpurity CitalopraM IMpurity
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 1651214-74-2 C29H37N7O4
Prasugrel Impurity 4 HCl Prasugrel Impurity 4 HCl 1618107-96-2 C20H22Cl2FNO3S
Tofacitinib Impurity K Tofacitinib Impurity K
N-(3-chloro-4-fluorophenyl)-7 -methoxy-6-(3-morpholinopropoxy)-N-(3-morpholinopropyl)quinazolin-4-amine N-(3-chloro-4-fluorophenyl)-7 -methoxy-6-(3-morpholinopropoxy)-N-(3-morpholinopropyl)quinazolin-4-amine 1502829-45-9 C29H37ClFN5O4
5-(hydroxymethyl)-1,2-dihydro-1,2,4-triazol-3-one 5-(hydroxymethyl)-1,2-dihydro-1,2,4-triazol-3-one 24021-90-7 C3H5N3O2
( 2-{4-[N-(5,6-diphenylpyrazin-2-yl)-N-isopropylamino]butyloxy}acetic acid tert-butylester ) ( 2-{4-[N-(5,6-diphenylpyrazin-2-yl)-N-isopropylamino]butyloxy}acetic acid tert-butylester ) 475084-96-9 C29H37N3O3
N-(4-Hydroxymethylbenzyl) Cyclam N-(4-Hydroxymethylbenzyl) Cyclam 176252-20-3 C18H32N4O
Alvimopan Impurity 3 Alvimopan Impurity 3
Nicergoline Impurity G Nicergoline Impurity G
Isavuconazole Impurity 1 Isavuconazole Impurity 1 2069200-13-9 C13H12F2N4O
Sofosbuvir Impurity23 Sofosbuvir Impurity23
Tacrolimus Impurity 1 Tacrolimus Impurity 1
Bisoprolol EP Impurity F Bisoprolol EP Impurity F 1798418-82-2 C18H31NO4
Pantoprazole EP Impurity F Pantoprazole EP Impurity F 721924-06-7 C17H17F2N3O4S
Rosuvastatin EP Impurity E Rosuvastatin EP Impurity E
Tiotropium EP Impurity C Tiotropium EP Impurity C 136310-95-7 C19H22BrNO3S2
Eliglustat intermediate 4 Eliglustat intermediate 4 491833-27-3 C23H30N2O4
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