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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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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

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, 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

Olmesartan Medoxomil

Olmesartan dimer ester

$755.00 25 mg

Limited Stock

CAS No.

: 1040250-19-8

Mol F.

: C48H50N12O5

Mol W.

: 874.99

Cat No.

: SA17712

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 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 EP Impurity A

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CAS No.

: 37052-78-1

Mol F.

: C8H8N2OS

Mol W.

: 180.23

Cat No.

: SA19407

Impurities, Omeprazole

Omeprazole EP Impurity C

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CAS No.

: 73590-85-9

Mol F.

: C17H19N3O2S

Mol W.

: 329.42

Cat No.

: SA19409

Impurities, Omeprazole

Omeprazole EP Impurity D

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CAS No.

: 88546-55-8

Mol F.

: C17H19N3O4S

Mol W.

: 361.42

Cat No.

: SA19410

Impurities, Omeprazole

Omeprazole EP Impurity E

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CAS No.

: 176219-04-8

Mol F.

: C17H19N3O4S

Mol W.

: 361.42

Cat No.

: SA19411

Impurities, Omeprazole

Omeprazole EP Impurity F

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CAS No.

: 125656-82-8

Mol F.

: C16H13N3O2S

Mol W.

: 311.36

Cat No.

: SA19412

Impurities, Omeprazole

Omeprazole EP Impurity G

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CAS No.

: 125656-83-9

Mol F.

: C16H13N3O2S

Mol W.

: 311.36

Cat No.

: SA19413

Impurities, Omeprazole

Omeprazole EP Impurity I

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CAS No.

: 158812-85-2

Mol F.

: C17H19N3O5S

Mol W.

: 377.41

Cat No.

: SA19415

Impurities, Omeprazole

Omeprazole Hydroxymethyl Impurity

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CAS No.

: 86604-78-6

Mol F.

: C9H13NO2

Mol W.

: 167.2

Cat No.

: SA19402

Impurities, Ondansetron

Ondansetron

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CAS No.

: 99614-01-4;103639-04-9(dihydrate)

Mol F.

: C18H19N3O

Mol W.

: 293.36

Cat No.

: SA35800

Impurities, Ondansetron

Ondansetron EP Impurity A

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CAS No.

: 153139-56-1

Mol F.

: C16H20N2O

Mol W.

: 256.33999999999997

Cat No.

: SA35801

Impurities, Ondansetron

Ondansetron EP Impurity B; Ondansetron Dimer

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CAS No.

: 1076198-52-1

Mol F.

: C37H38N6O2

Mol W.

: 598.73

Cat No.

: SA35802

Impurities, Ondansetron

Ondansetron EP Impurity C

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CAS No.

: 27387-31-1

Mol F.

: C13H13NO

Mol W.

: 199.25

Cat No.

: SA35803

Impurities, Ondansetron

Ondansetron EP Impurity D

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CAS No.

: 99614-64-9

Mol F.

: C14H13NO

Mol W.

: 211.26

Cat No.

: SA35804

Impurities, Ondansetron

Ondansetron EP Impurity E

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CAS No.

: NA

Mol F.

: C3H4N2

Mol W.

: 68.08

Cat No.

: SA35805

Impurities, Ondansetron

Ondansetron EP Impurity F

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CAS No.

: 693-98-1

Mol F.

: C4H6N2

Mol W.

: 82.1

Cat No.

: SA35806

Impurities, Ondansetron

Ondansetron EP Impurity G

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CAS No.

: 99614-03-6

Mol F.

: C17H17N3O

Mol W.

: 279.33999999999997

Cat No.

: SA35807

Donepezil, Impurities

Open-Ring Hydroxy Acid Donepezil Impurity

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CAS No.

: NA

Mol F.

: C24H31NO5

Mol W.

: 413.51

Cat No.

: SA34318

Donepezil, Impurities

Open-Ring Keto Acid Donepezil Impurity

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CAS No.

: 197010-25-6

Mol F.

: C24H28NNaO5

Mol W.

: 433.47

Cat No.

: SA34319

Impurities, Orphenadrine

Orphenadrine

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CAS No.

: 4682-36-4

Mol F.

: C18H23NO

Mol W.

: 269.38

Cat No.

: SA28300

Impurities, Orphenadrine

Orphenadrine EP Impurity A

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CAS No.

: 5472-13-9

Mol F.

: C14H14O

Mol W.

: 198.26

Cat No.

: SA28301

Impurities, Orphenadrine

Orphenadrine EP Impurity B

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CAS No.

: 131-58-8

Mol F.

: C14H12O

Mol W.

: 196.24

Cat No.

: SA28302