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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Cefadroxil, Impurities

Methoxy Cefadroxil

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Out of Stock

CAS No.

: NA

Mol F.

: C17H19N3O6S

Mol W.

: 393.4

Cat No.

: SA42303

Colesevelam, Impurities

Methoxyquat Iodide

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Out of Stock

CAS No.

: 863031-14-5

Mol F.

: C10H24INO

Mol W.

: 301.21

Cat No.

: SA10211

Impurities, Pregabalin

Methyl ((S)-4-Methyl-2-[2-oxo-2-[[(S)-1-phenylethyl]amino]ethyl]pentyl]carbamate

$145.00 25 mg

Out of Stock

CAS No.

: 930280-44-7

Mol F.

: C18H28N2O3

Mol W.

: 320.43

Cat No.

: SA24839

Impurities, Riociguat

Methyl (4-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-6-((methoxycarbonyl)amino)pyrimidin-5-yl)(methyl)carbamate

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Out of Stock

CAS No.

: 2518331-19-4

Mol F.

: C22H21FN8O4

Mol W.

: 480.5

Cat No.

: SA50817

Impurities, Riociguat

Methyl (4-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-6-(methylamino)pyrimidin-5-yl)carbamate

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Out of Stock

CAS No.

: 2514697-53-9

Mol F.

: C20H19FN8O2

Mol W.

: 422.4

Cat No.

: SA50815

Impurities, Riociguat

Methyl (4,6-diamino-2-(1-(3-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidin-5-yl)(methyl)carbamate

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Out of Stock

CAS No.

Mol F.

: C20H19FN8O2

Mol W.

: 422.4

Cat No.

: SA50818

Impurities, Nirmatrelvir

Methyl (S)-2-amino-3-((S)-2-oxopyrrolidin-3-yl)propanoate

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Out of Stock

CAS No.

: 1027601-37-1

Mol F.

: C8H14N2O3

Mol W.

: 186.2

Cat No.

: SA46910

Impurities, Riociguat

Methyl 1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carbimidate

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Out of Stock

CAS No.

: 304874-06-4

Mol F.

: C15H13FN4O

Mol W.

: 284.3

Cat No.

: SA50812

Cariprazine, Impurities

Methyl 2-((1r,4r)-4-(3,3-dimethylureido)cyclohexyl)acetate

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Out of Stock

CAS No.

Mol F.

: C12H22N2O3

Mol W.

: 242.3

Cat No.

: SA39718

Impurities, Rosuvastatin

methyl 2-((4R,6S)-2,2-dimethyl-6-((5-methyl-1,3,4-thiadiazol-2-ylsulfonyl)methyl)-1,3-dioxan-4-yl)acetate

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Out of Stock

CAS No.

Mol F.

: C13H20N2O6S2

Mol W.

: 364.44

Cat No.

: SA121129

Impurities, Rosuvastatin

methyl 2-hydroxy-4-isopropyl-6-phenylpyrimidine-5-carboxylate

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Out of Stock

CAS No.

Mol F.

: C15H16N2O3

Mol W.

: 272.30

Cat No.

: SA121112

Impurities, Terbinafine

Methyl 2,2-dimethyl-3-butynoate

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Out of Stock

CAS No.

: 95924-34-8

Mol F.

: C7H10O2

Mol W.

: 126.15

Cat No.

: SA25716

Impurities, Prucalopride

Methyl 4-acetamido-3-bromo-2-(2-bromoethoxy)-5-chlorobenzoate

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Out of Stock

CAS No.

: 748788-39-8

Mol F.

: C12H12Br2ClNO4

Mol W.

: 429.49

Cat No.

: SA43110

Impurities, Metoclopramide

Methyl 4-Amino-2-methoxybenzoate

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Out of Stock

CAS No.

: 27492-84-8

Mol F.

: C₉H₁₁NO₃

Mol W.

: 181.19

Cat No.

: SA30609

Impurities, Leflunomide

Methyl 5-Methyl-3-isoxazolecarboxylate

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Out of Stock

CAS No.

: 19788-35-3

Mol F.

: C6H7NO3

Mol W.

: 141.12

Cat No.

: SA21814

Impurities, Ribociclib

Methyl 7-cyclopentyl-2-((5-(piperazin-1-yl)pyridin-2-yl)amino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylate

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Out of Stock

CAS No.

: NA

Mol F.

: C22H27N7O2

Mol W.

: 421.51

Cat No.

: SA47107

Flurbiprofen, Impurities

Methyl Flurbiprofen

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Out of Stock

CAS No.

: 66202-86-6

Mol F.

: C16H15FO2

Mol W.

: 258.29

Cat No.

: SA14614

Gabapentin, Impurities

Methyl Gabapentin Ester

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Out of Stock

CAS No.

: 138799-98-1

Mol F.

: C10H19NO2

Mol W.

: 185.26

Cat No.

: SA22810

Impurities, Olmesartan Medoxomil

Methyl Triphenylmethyl Ether

$155.00 25 mg

Out of Stock

CAS No.

: 596-31-6

Mol F.

: C20H18O

Mol W.

: 274.36

Cat No.

: SA17754

Impurities, Varenicline

Methyl Varenicline

Please enquire for price & pack size

Out of Stock

CAS No.

: 1333145-89-3

Mol F.

: C„H…Nƒ

Mol W.

: 225.29

Cat No.

: SA39511

Impurities, Riociguat

Methyl-Dihydropurinone {6-amino-2-[1-(2-fluorobenzyl)-1H-pyrazolo [3, 4-b] pyridin-3-yl]-7-methyl-7, 9-dihydro-8H-purin-8-one}

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Out of Stock

CAS No.

: 1361569-18-7

Mol F.

: C19H15FN8O

Mol W.

: 390.4

Cat No.

: SA50821

Carbidopa, Impurities

Methyldopa EP Impurity A | CAS : 6739-31-7

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Out of Stock

CAS No.

: 6739-31-7

Mol F.

: C11H15NO4

Mol W.

: 225.24

Cat No.

: SA13815

Efinaconazole, Impurities

Methylene Methanone Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 188904-84-9

Mol F.

: C13H15NO

Mol W.

: 201.26

Cat No.

: SA23601

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate

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Out of Stock

CAS No.

: 53-36-1

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA25003

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity H

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Out of Stock

CAS No.

: 1968-76-9

Mol F.

: C24H32O4

Mol W.

: 384.51

Cat No.

: SA25007

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity I

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Out of Stock

CAS No.

: 6870-94-6

Mol F.

: C22H30O4

Mol W.

: 358.47

Cat No.

: SA25009

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity J

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Out of Stock

CAS No.

: 1048031-82-8

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA25010

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate Impurity D

$195.00 25 mg

Out of Stock

CAS No.

: 150899-33-5

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA25001

Impurities, Methylprednisolone

Methylprednisolone EP Impurity H

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Out of Stock

CAS No.

: 18462-27-6

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA14409

Impurities, Methylprednisolone

Methylprednisolone EP Impurity K

$95.00 25 mg

Out of Stock

CAS No.

: 50-24-8

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA14411

Impurities, Metoclopramide

Metoclopramide

Please enquire for price & pack size

Out of Stock

CAS No.

: 364-62-5

Mol F.

: C₁₄H₂₂ClN₃O₂

Mol W.

: 299.8

Cat No.

: SA30600

Impurities, Metoclopramide

Metoclopramide EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 5608-13-9

Mol F.

: C16H24ClN3O3

Mol W.

: 341.83

Cat No.

: SA30601

Impurities, Metoclopramide

Metoclopramide EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 4093-31-6

Mol F.

: C11H12ClNO4

Mol W.

: 257.67

Cat No.

: SA30602

Impurities, Metoclopramide

Metoclopramide EP Impurity C

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Out of Stock

CAS No.

: 7206-70-4

Mol F.

: C8H8ClNO3

Mol W.

: 201.61

Cat No.

: SA30603

Impurities, Metoclopramide

Metoclopramide EP Impurity D

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Out of Stock

CAS No.

: 4093-29-2

Mol F.

: C11H13NO4

Mol W.

: 223.23

Cat No.

: SA30604

Impurities, Metoclopramide

Metoclopramide EP Impurity E

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Out of Stock

CAS No.

: 100-36-7

Mol F.

: C6H16N2

Mol W.

: 116.2

Cat No.

: SA30605

Impurities, Metoclopramide

Metoclopramide EP Impurity F

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Out of Stock

CAS No.

: 38339-95-6; 38059-78-8 (HCl salt)

Mol F.

: C13H20ClN3O2

Mol W.

: 285.77

Cat No.

: SA30606

Impurities, Metoclopramide

Metoclopramide EP Impurity G

Please enquire for price & pack size

Out of Stock

CAS No.

: 171367-22-9

Mol F.

: C14H22ClN3O3

Mol W.

: 315.8

Cat No.

: SA30607

Impurities, Metoclopramide

Metoclopramide EP Impurity H

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Out of Stock

CAS No.

: 50-86-2

Mol F.

: C9H9NO4

Mol W.

: 195.17

Cat No.

: SA30608

Impurities, Metoprolol

Metoprolol

Please enquire for price & pack size

Out of Stock

CAS No.

: 51384-51-1

Mol F.

: C15H25NO3

Mol W.

: 267.36

Cat No.

: SA41400

Impurities, Metoprolol

Metoprolol Acid Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 29112-40-1

Mol F.

: C16H25NO4

Mol W.

: 295.37

Cat No.

: SA41413

Impurities, Metoprolol

Metoprolol Acid Methyl Ester

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Out of Stock

CAS No.

: 29121-23-1 (base) ; 83281-59-8 (HCL salt)

Mol F.

: C15H23NO4

Mol W.

: 281.35

Cat No.

: SA41419

Impurities, Metoprolol

Metoprolol Bis Propanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 230975-30-1

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA41422

Impurities, Metoprolol

Metoprolol EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 109632-08-8

Mol F.

: C„H‚ƒNOƒ

Mol W.

: 253.34

Cat No.

: SA41401

Impurities, Metoprolol

Metoprolol EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 56718-71-9

Mol F.

: C‰H‚O‚

Mol W.

: 152.19

Cat No.

: SA41402

Impurities, Metoprolol

Metoprolol EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 29122-74-5

Mol F.

: C13H19NO3

Mol W.

: 237.29

Cat No.

: SA41403

Impurities, Metoprolol

Metoprolol EP Impurity D

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Out of Stock

CAS No.

: 62572-90-1

Mol F.

: C‚HˆO„

Mol W.

: 226.27

Cat No.

: SA41404

Impurities, Metoprolol

Metoprolol EP Impurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 163685-38-9

Mol F.

: C15H25NO3

Mol W.

: 267.36

Cat No.

: SA41405

Impurities, Metoprolol

Metoprolol EP Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

: 7695-63-8

Mol F.

: C‚H‰NO‚

Mol W.

: 209.28

Cat No.

: SA41406

Impurities, Metoprolol

Metoprolol EP Impurity G

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Out of Stock

CAS No.

: 501-94-0

Mol F.

: CˆH€O‚

Mol W.

: 138.16

Cat No.

: SA41407