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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Impurities, Norethindrone

Norethisterone Enanthate

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CAS No.

: 3836-23-5

Mol F.

: C27H38O3

Mol W.

: 410.59

Cat No.

: SA13436

Impurities, Norgestimate

Norgestimate

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CAS No.

: 35189-28-7

Mol F.

: C23H31NO3

Mol W.

: 369.5

Cat No.

: SA15904

Impurities, Norgestrel

Norgestrel

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CAS No.

: 6533-00-2

Mol F.

: C21H28O2

Mol W.

Cat No.

: SA16801

Impurities, Neostigmine

Norneostigmine; 3-(Dimethylamino)phenyl Dimethylcarbamate

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CAS No.

: 16088-19-0

Mol F.

: C11H16N2O2

Mol W.

: 208.26

Cat No.

: SA19701

Impurities, Tiotropium

Norscopine

$650.00 25 mg

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CAS No.

Mol F.

: C7H11NO2

Mol W.

: 141.17

Cat No.

: SA11720

Impurities, Tiotropium

Norscopolamine

$650.00 25 mg

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CAS No.

: 4684-28-0

Mol F.

: C16H19NO4

Mol W.

: 289.3

Cat No.

: SA11725

Impurities, Naloxone

O- Allyloxymorphone

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CAS No.

: NA

Mol F.

: C20H23NO4

Mol W.

: 341.4

Cat No.

: SA45103

Guanine, Impurities

O-[4-(Aminomethyl)benzyl]guanine

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CAS No.

: 674799-96-3

Mol F.

: C₁₃H₁₄N₆O

Mol W.

: 270.29

Cat No.

: SA32102

Ganciclovir, Impurities

O-Acetyl N-Benzyloxycarbonyl Valganciclovir

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CAS No.

: 194159-22-3

Mol F.

: C₂₄H₃₀N₆O₈

Mol W.

: 530.53

Cat No.

: SA13703

Impurities, Salmeterol

O-Benzyl Salmeterol

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CAS No.

: NA

Mol F.

: C32H43NO4

Mol W.

: 505.69

Cat No.

: SA10117

Dapagliflozin, Impurities

o-Bromo Dapagliflozin Impurity

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CAS No.

Mol F.

: C21H25BrO6

Mol W.

: 453.32

Cat No.

: SA15070

Impurities, Salmeterol

O-Bromophenyl Dibenzyl Salmeterol

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CAS No.

: NA

Mol F.

: C39H48BrNO4

Mol W.

Cat No.

: SA10118

Brexpiprazole, Impurities

O-butyl Bromide Dimer

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CAS No.

: NA

Mol F.

: C26H27BrN2O5

Mol W.

: 511.41

Cat No.

: SA41315

Brexpiprazole, Impurities

O-butyl Bromide Quinolinone

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CAS No.

: NA

Mol F.

: C13H14BrNO2

Mol W.

: 296.16

Cat No.

: SA41311

Brexpiprazole, Impurities

O-butyl Chloride Dimer

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CAS No.

: 2060029-80-1

Mol F.

: C26H27ClN2O4

Mol W.

: 466.95

Cat No.

: SA41314

Brexpiprazole, Impurities

O-butyl Chloride Quinolinone

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CAS No.

: NA

Mol F.

: C13H14ClNO2

Mol W.

: 251.71

Cat No.

: SA41310

Brexpiprazole, Impurities

O-Butyl Iodide Quinolinone

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CAS No.

: 1191901-09-3

Mol F.

: C13H14INO2

Mol W.

: 343.16

Cat No.

: SA41312

Dapagliflozin, Impurities

o-Chloro Dapagliflozin Impurity

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CAS No.

Mol F.

: C21H25ClO6

Mol W.

: 408.87

Cat No.

: SA15069

Febuxostat, Impurities

O-Desisobutyl-O-n-propyl Febuxostat

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CAS No.

: 1530308-87-2

Mol F.

: C15H14N2O3S

Mol W.

: 302.35000000000002

Cat No.

: SA32012

Impurities, Sofosbuvir

O-Desisopropyl O-Desphenyl Sofosbuvir; Sofosbuvir metabolite GS-566500

$595.00 25 mg

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CAS No.

: 1233335-78-8

Mol F.

: C13H19FN3O9P

Mol W.

: 411.28

Cat No.

: SA15440

Brinzolamide, Impurities

O-Desmethyl Brinzolamide Impurity

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CAS No.

: 186377-56-0

Mol F.

: C11H19N3O5S3

Mol W.

: 369.48

Cat No.

: SA47203

Formoterol, Impurities

O-Desmethyl Formoterol Impurity

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CAS No.

: 49861-92-9

Mol F.

: C18H22N2O4

Mol W.

: 330.4

Cat No.

: SA21115

Impurities, Lazertinib

O-Desmethyl Lazertinib

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CAS No.

: NA

Mol F.

: C29H32N8O3

Mol W.

: 540.6

Cat No.

: SA53405

Impurities, Venlafaxine

O-Desmethyl Venlafaxine Dimer

$1,995.00 50 mg

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CAS No.

: 1187545-62-5

Mol F.

: C33H50N2O4

Mol W.

: 538.76

Cat No.

: SA22731

Impurities, Venlafaxine

O-Desmethyl Venlafaxine N-Dimer | CAS : 1187545-61-4

$1,995.00 50 mg

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CAS No.

: 1187545-61-4

Mol F.

: C32H48N2O4

Mol W.

: 524.7

Cat No.

: SA22728

Cefadroxil, Impurities

O-Ethoxycarbonyl Cefadroxil

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CAS No.

: 2378158-44-0

Mol F.

: C19H21N3O7S

Mol W.

: 435.45

Cat No.

: SA42302

Ezetimibe, Impurities

O-Fluoro oxazolidone

$100.00 25 mg

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CAS No.

: 2514695-40-8

Mol F.

: C20H18FNO4

Mol W.

: 355.36

Cat No.

: SA14832

Brimonidine, Impurities

O-Isopropyl (5-Bromoquinoxalin-6-yl)carbamothioate

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CAS No.

: NA

Mol F.

: C12H12BrOS

Mol W.

: 326.20999999999998

Cat No.

: SA20716

Impurities, Olmesartan Medoxomil

O-Methyl Ether Olmesartan Acid

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CAS No.

: 1039762-40-7

Mol F.

: C25H28N6O3

Mol W.

: 460.53

Cat No.

: SA17736

Impurities, Olaparib

Olaparib

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CAS No.

: NA

Mol F.

: C24H23FN4O3

Mol W.

: 434.46

Cat No.

: SA37400

Impurities, Olaparib

Olaparib 3-Hydroxypiperazine Impurity

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CAS No.

: NA

Mol F.

: C24H23FN4O4

Mol W.

: 450.46

Cat No.

: SA37404

Impurities, Olaparib

Olaparib Descyclopropanecarbonyl Impurity

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CAS No.

: NA

Mol F.

: C20H19FN4O2

Mol W.

: 366.39

Cat No.

: SA37401

Impurities, Olaparib

Olaparib Hydroxy Impurity

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CAS No.

: 1460272-53-0

Mol F.

: C24H23FN4O4

Mol W.

: 450.46

Cat No.

: SA37403

Impurities, Nitrosamine, Olaparib

Olaparib N-Nitroso Piperazine Impurity

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CAS No.

: 2742659-74-9

Mol F.

: C20H18FN5O3

Mol W.

: 395.39

Cat No.

: SA37405

Impurities, Olaparib

Olaparib Piperazine Open Ring Analogue

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CAS No.

: NA

Mol F.

: C24H25FN4O4

Mol W.

: 452.48

Cat No.

: SA37402

Impurities, Olmesartan Medoxomil

Olmesartan (5-acetyl) Imidazolyl Impurity | CAS : 2411637-68-6

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CAS No.

: 2411637-68-6

Mol F.

: C11H18N2O2

Mol W.

: 210.3

Cat No.

: SA17758

Impurities, Olmesartan Medoxomil

Olmesartan amide Dimer Impurity

$495.00 25 mg

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CAS No.

Mol F.

: C53H54N12O8

Mol W.

: 987.07

Cat No.

: SA17755

Impurities, Olmesartan Medoxomil

Olmesartan Anhydro Acid Ethyl Ester

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CAS No.

Mol F.

: C26H28N6O2

Mol W.

: 456.54

Cat No.

: SA17724

Impurities, Olmesartan Medoxomil

Olmesartan Anhydro Acid N1-Trityl Ethyl Ester

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CAS No.

Mol F.

: C45H42N6O2

Mol W.

: 698.85

Cat No.

: SA17723

Impurities, Olmesartan Medoxomil

Olmesartan Bis-medoxomil (1H-1-Medoxomil + 2H-2-Medoxomil Mixture)

$495.00 25 mg

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CAS No.

: 1392475-91-0

Mol F.

: C34H34N6O9

Mol W.

: 670.67

Cat No.

: SA17742

Impurities, Olmesartan Medoxomil

Olmesartan Imidazole 2-hydroxybutanyl Impurity

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CAS No.

: 172875-53-5

Mol F.

: C13H22N2O3

Mol W.

: 254.33

Cat No.

: SA17759

Impurities, Olmesartan Medoxomil

Olmesartan Imidazole Diacid Impurity

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CAS No.

: 58954-23-7

Mol F.

: C8H10N2O4

Mol W.

: 198.18

Cat No.

: SA17753

Impurities, Olmesartan Medoxomil

Olmesartan Impurity SA17752

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CAS No.

: 1392475-91-0

Mol F.

: C34H34N6O9

Mol W.

: 670.67

Cat No.

: SA17752

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil Azide Impurity

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CAS No.

: NA

Mol F.

: C29H29N9O5

Mol W.

: 583.60

Cat No.

: SA17760

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil Ethyl Methyl Analog

$195.00 25 mg

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CAS No.

: 1378863-74-1

Mol F.

: C30H32N6O6

Mol W.

: 572.61

Cat No.

: SA17703

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil Methyl Ether

$395.00 25 mg

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CAS No.

: 896419-17-3

Mol F.

: C30H32N6O6

Mol W.

: 572.61

Cat No.

: SA17732

Impurities, Olmesartan Medoxomil

Olmesartan Methyl Ester

$195.00 25 mg

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CAS No.

: 1347262-29-6

Mol F.

: C25H28N6O3

Mol W.

: 460.53

Cat No.

: SA17734

Impurities, Olmesartan Medoxomil

Olmesartan Methyl Ketone

$495.00 25 mg

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CAS No.

: 1227626-45-0

Mol F.

: C25H28N6O2

Mol W.

: 444.53

Cat No.

: SA17733

Impurities, Olmesartan Medoxomil

Olmesartan N1-Trityl Impurity

$95.00 25 mg

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CAS No.

Mol F.

: C43H40N6O3

Mol W.

: 688.82

Cat No.

: SA17718

Impurities, Omeprazole

Omeprazole 5-Methoxy-2-benzimidazolinone Impurity

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CAS No.

: 2080-75-3

Mol F.

: C8H8N2O2

Mol W.

: 164.2

Cat No.

: SA19418