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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
alpha-(chloromethyl)-2-hydroxymethyl-5-nitroimidazole-1-ethanol alpha-(chloromethyl)-2-hydroxymethyl-5-nitroimidazole-1-ethanol 62580-79-4 C7H10ClN3O4
4-hydroxypenicillin V 4-hydroxypenicillin V 20880-67-5 C16H18N2O6S
BENAZEPRILAT BENAZEPRILAT 86541-78-8 C22H24N2O5
2-PIPERIDIN-4-YL-1H-BENZOIMIDAZOLE 2-PIPERIDIN-4-YL-1H-BENZOIMIDAZOLE 38385-95-4 C12H15N3
4-CHLORO-3,5-DIMETHYL 2-CHLORMETHYL PYRIDINE.HCL 4-CHLORO-3,5-DIMETHYL 2-CHLORMETHYL PYRIDINE.HCL 142885-96-9 C8H9Cl2N
9-DIHYDROESTRADIOL 9-DIHYDROESTRADIOL 791-69-5 C18H22O2
Pramipexole Impurity 19 Pramipexole Impurity 19 106006-84-2 C10H15N3OS
3-Morpholinone, 4-phenyl- 3-Morpholinone, 4-phenyl- 29518-11-4 C10H11NO2
H 128/80 H 128/80 29122-74-5 C13H19NO3
4’-Hydroxy Atomoxetine -D-Glucuronide 4’-Hydroxy Atomoxetine -D-Glucuronide 540729-08-6 C23H29NO8
Decarboxy Ciprofloxacin Decarboxy Ciprofloxacin 105394-83-0 C16H18FN3O
Zolpidem 6-Carboxylic Acid Zolpidem 6-Carboxylic Acid 109461-15-6 C19H19N3O3
Myricetin 3-β-D-glucopyranoside Myricetin 3-β-D-glucopyranoside 19833-12-6 C21H20O13
2,4,5-Trifluoro-3-methoxybenzoyl chloride 2,4,5-Trifluoro-3-methoxybenzoyl chloride 112811-66-2 C8H4ClF3O2
1-(Dimethoxymethyl)-2-methoxybenzene 1-(Dimethoxymethyl)-2-methoxybenzene 58378-33-9 C10H14O3
N-(2-BENZOYL-4-CHLOROPHENYL)FORMAMIDE N-(2-BENZOYL-4-CHLOROPHENYL)FORMAMIDE 10352-28-0 C14H10ClNO2
Benzylpenicillin EP Impurity Benzylpenicillin EP Impurity 5985-13-7 C16H19N2NaO5S
4,4,4-TRIFLUORO-1-(3-METHYLPHENYL)-1,3-BUTANEDIONE 4,4,4-TRIFLUORO-1-(3-METHYLPHENYL)-1,3-BUTANEDIONE 53764-99-1 C11H9F3O2
Albendazole EP Impurity J Albendazole EP Impurity J 946498-41-5 C9H7Cl2N3O2
Ibrutinib Dimer Impurity Ibrutinib Dimer Impurity 2031255-23-7 C50H48N12O4
Rifaximin EP Impurity H Rifaximin EP Impurity H 1210022-90-4 C43H51N3O12
Voriconazole (2R,3R)-Isomer Voriconazole (2R,3R)-Isomer 137234-76-5 C16H13ClF3N5O
Diquafosol Impurity 12 Diquafosol Impurity 12 694434-51-0 C18H26N4O23P4
Etoricoxib Impurity 39 Etoricoxib Impurity 39 107825-28-5 C13H17NOS2
Furosemide Impurity 7 Furosemide Impurity 7 4753-68-8 C5H8ClNO
Irinotecan Impurity 24 Irinotecan Impurity 24 802277-44-7 C13H24N2O2
Pyridoxine Impurity 12 Pyridoxine Impurity 12 58947-70-9 C8H9NO3
Thiamine Thiamine 6309-04-2 C13H20Br2N4OS
1,1'-(1,4,8,11-tetraazacyclotetradecane-1,4-diyl)bis(2,2,2- trifluoroethan-1-one) dihydrochloride 1,1'-(1,4,8,11-tetraazacyclotetradecane-1,4-diyl)bis(2,2,2- trifluoroethan-1-one) dihydrochloride C14H24Cl2F6N4O2
Empagliflozin Impurity 40 Empagliflozin Impurity 40
Empagliflozin Impurity 46 Empagliflozin Impurity 46
Mupirocin Impurity P/Decyl [2E,8[2S,3S(1S,2S)]]-5,9-Anhydro-2,3,4,8-tetradeoxy-8-[[3-(2-hydroxy-1-methylpropyl)oxiranyl]methyl]-3-methyl-L-talo-Non-2-enonic Acid Ester Mupirocin Impurity P/Decyl [2E,8[2S,3S(1S,2S)]]-5,9-Anhydro-2,3,4,8-tetradeoxy-8-[[3-(2-hydroxy-1-methylpropyl)oxiranyl]methyl]-3-methyl-L-talo-Non-2-enonic Acid Ester 153900-96-0 C27H48O7
Aprepitant Aprepitant 1242175-38-7 C20H18F7NO2
pranoprofen pranoprofen 143436-36-6 C17H19NO4
2-[(1,3-dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]Benzonitrile 2-[(1,3-dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]Benzonitrile 906673-30-1 C14H10BNO3
Fluconazole Impurity 5 Fluconazole Impurity 5 154534-83-5 C10H9ClF2N4O
Fexofenadine N-Oxide Fexofenadine N-Oxide 1422515-52-3 C32H39NO5
Trimetazidine Impurity 16 Trimetazidine Impurity 16 118709-62-9 C13H16O4
Ortho-Isomer of Dapagliflozin Ortho-Isomer of Dapagliflozin 2040305-05-1 C21H25ClO6
Acarbose Impurity H Acarbose Impurity H
DU 6856 DU 6856 127254-11-9 C19H18ClF2N3O3
Nsc249004 Nsc249004 7428-39-9 C9H13N3O5
(3S,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic acid (3S,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic acid 254452-86-3 C25H24FNO4
(E)-4-Acetoxy Tamoxifen (E)-4-Acetoxy Tamoxifen 76117-70-9 C28H31NO3
Atorvastatin Cyclic Isopropyl Impurity Atorvastatin Cyclic Isopropyl Impurity 873950-17-5 C33H35FN2O7
O-Acetyl Losartan O-Acetyl Losartan 1006062-27-6 C24H25ClN6O2
(5-Iodo-2-chlorophenyl)(4-ethoxyphenyl)methanone (5-Iodo-2-chlorophenyl)(4-ethoxyphenyl)methanone 1103738-26-6 C15H12ClIO2
3-Dechloro-4-chloro Lamotrigine 3-Dechloro-4-chloro Lamotrigine 38943-76-9 C9H7Cl2N5
D-2’-Deoxyribofuranosyl-3-guanylurea (α/β-Mixture) D-2’-Deoxyribofuranosyl-3-guanylurea (α/β-Mixture) 570410-72-9 C7H14N4O4
Difluoro Atorvastatin Difluoro Atorvastatin 693794-20-6 C66H66CaF4N4O10
(4S,trans)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate (4S,trans)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate 1105067-89-7 C14H27NO4
rac 5-Keto Fluvastatin rac 5-Keto Fluvastatin 1160169-39-0 C24H24FNO4
9-Piperazino Ofloxacin 9-Piperazino Ofloxacin 197291-75-1 C18H20FN3O4
Thyroxine-4-hydroxy-3,5-diiodophenyl Ether DISCONTINUED Thyroxine-4-hydroxy-3,5-diiodophenyl Ether DISCONTINUED 911661-90-0 C21H13I6NO5
Chidamide-13C7 Chidamide-13C7 1348337-81-4 C24H18N4O4
Imidafenacin Related Compound 9 Imidafenacin Related Compound 9 170105-17-6 C21H21N3
Atracurium Impurity M Atracurium Impurity M
Cefminox Sodium impurity 1 Cefminox Sodium impurity 1
Dapagliflozin Impurity 5 Dapagliflozin Impurity 5
Emtricitabine Impurity E Emtricitabine Impurity E
Furosemide Impurity 4 Furosemide Impurity 4 C12H11ClN2O5S
Pitavastatin Impurity 43 Pitavastatin Impurity 43
Tazobactam Impurity B Tazobactam Impurity B 158411-82-6 C6H11NO3S
Tirofiban Impurity E Tirofiban Impurity E
Tofacitinib Impurity 73 Tofacitinib Impurity 73
Tofacitinib Impurity 82 Tofacitinib Impurity 82
Apixaban Impurity 37 Apixaban Impurity 37
Atracurium Impurity 27 Atracurium Impurity 27
Aztreonam Impurity 3 Aztreonam Impurity 3
Aztreonam Impurity 9 Aztreonam Impurity 9
Bendamustine Impurity 24 Bendamustine Impurity 24
Bosutinib Impurity 4 Bosutinib Impurity 4 142072-71-7 C10H11NO4
Cefazolin EP Impurity L Cefazolin EP Impurity L
Cefoxitin Impurity 2 Cefoxitin Impurity 2
Clotrimazole Impurity 4 Clotrimazole Impurity 4
Dasatinib impurity 29 Dasatinib impurity 29 1417651-54-7 C21H16Cl3N7OS
Erlotinib Impurity 58 Erlotinib Impurity 58 2246399-22-2 C10H12N2O3
Lamivudine Impurity 4 Lamivudine Impurity 4
Olaparib Impurity 37 Olaparib Impurity 37
Oseltamivir Impurity 3 Oseltamivir Impurity 3
Phenylephrine Impurity 2 Phenylephrine Impurity 2 C9H13NO2
Pitavastatin Impurity 23 Pitavastatin Impurity 23 1467166-39-7 C28H28FNO4
Pregabalin Impurity 24 Pregabalin Impurity 24
Rocuronium Bromide Impurity 11 Rocuronium Bromide Impurity 11
Rocuronium Bromide Impurity 24 Rocuronium Bromide Impurity 24
Rosuvastatin EP Impurity L Rosuvastatin EP Impurity L
Timolol EP Impurity J Timolol EP Impurity J
Trimetazidine Impurity 7 Trimetazidine Impurity 7
Apremilast Impurity TNB Apremilast Impurity TNB
Atracurium Impurity N Atracurium Impurity N
Avibactam Impurity X Avibactam Impurity X
Cefazolin Impurity L Cefazolin Impurity L
Ceftazidime hetero trans oxidation Impurity Ceftazidime hetero trans oxidation Impurity
Regorafenib Impurity 17 Regorafenib Impurity 17
Ropivacaine Impurity 45 Ropivacaine Impurity 45
Sildenafil Impurity 17 Sildenafil Impurity 17 C22H30N6O4S
Sugammadex sodium Org199074-1 Impurity Sugammadex sodium Org199074-1 Impurity
Sugammadex sodium Org238832-1 Impurity Sugammadex sodium Org238832-1 Impurity
Afatinib impurity 33 Afatinib impurity 33
Avibactam Impurity 38 Avibactam Impurity 38 2241730-86-7 C20H29BrN2O5
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