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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, Manidipine

Manidipine

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CAS No.

: 89226-50-6

Mol F.

: C₃₅H₃₈N₄O₆

Mol W.

: 610.70000000000005

Cat No.

: SA29800

Impurities, Manidipine

Manidipine Dihydrochloride

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CAS No.

: 89226-75-5

Mol F.

: C₃₅H₄₀Cl₂N₄O₆

Mol W.

: 683.63

Cat No.

: SA29804

Impurities, Meclofenamic Acid

Meclofenamic Acid

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CAS No.

: 644-62-2

Mol F.

: C14H11Cl2NO2

Mol W.

: 296.15

Cat No.

: SA10601

Impurities, Medroxyprogesterone Acetate

Medroxyprogesterone Acetate EP Impurity A

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CAS No.

: 984-47-4

Mol F.

: C24H34O5

Mol W.

: 402.52

Cat No.

: SA27800

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate 6α-Hydroxy Impurity

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CAS No.

: 984-46-3

Mol F.

: C24H34O5

Mol W.

: 402.52

Cat No.

: SA27809

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity B

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CAS No.

: 520-85-4

Mol F.

: C22H32O3

Mol W.

: 344.49

Cat No.

: SA27801

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity C

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CAS No.

: NA

Mol F.

: C24H34O4

Mol W.

: 386.52

Cat No.

: SA27802

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity D

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CAS No.

: 2242-65-1

Mol F.

: C24H34O4

Mol W.

: 386.52

Cat No.

: SA27803

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity E

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CAS No.

: 32634-95-0

Mol F.

: C24H32O4

Mol W.

: 384.51

Cat No.

: SA27804

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity F

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CAS No.

: 69688-15-9

Mol F.

: C24H36O4

Mol W.

: 388.54

Cat No.

: SA27805

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity G

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CAS No.

: 595-33-5

Mol F.

: C24H32O4

Mol W.

: 384.51

Cat No.

: SA27806

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity H

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CAS No.

: 302-23-8

Mol F.

: C23H32O4

Mol W.

: 372.50

Cat No.

: SA27807

Impurities, Medroxyprogesterone Acetate

Medroxyprogestrone Acetate EP Impurity I

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CAS No.

: NA

Mol F.

: C22H32O3

Mol W.

: 344.49

Cat No.

: SA27808

Impurities, Mesalamine

Mesalamine impurity A

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CAS No.

: 123-30-8

Mol F.

: C₆H₇NO

Mol W.

: 109.13

Cat No.

: SA21300

Impurities, Mesalamine

Mesalamine impurity B

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CAS No.

: 591-27-5

Mol F.

: C₆H₇NO

Mol W.

: 109.13

Cat No.

: SA21301

Impurities, Mesalamine

Mesalamine impurity C

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CAS No.

: 95-55-6

Mol F.

: C₆H₇NO

Mol W.

: 109.13

Cat No.

: SA21302

Impurities, Mesalamine

Mesalamine impurity D

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CAS No.

: 99-05-8

Mol F.

: C₇H₇NO₂

Mol W.

: 137.13999999999999

Cat No.

: SA21303

Impurities, Mesalamine

Mesalamine impurity E

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CAS No.

: 65-49-6

Mol F.

: C₇H₇NO₃

Mol W.

: 153.13999999999999

Cat No.

: SA21304

Impurities, Mesalamine

Mesalamine impurity F

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CAS No.

: 570-23-0

Mol F.

: C₇H₇NO₃

Mol W.

: 153.13999999999999

Cat No.

: SA21305

Impurities, Mesalamine

Mesalamine impurity G

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CAS No.

: 490-79-9

Mol F.

: C7H6O4

Mol W.

: 154.12

Cat No.

: SA21306

Impurities, Mesalamine

Mesalamine impurity H

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CAS No.

: 69-72-7

Mol F.

: C₇H₆O₃

Mol W.

: 138.12

Cat No.

: SA21307

Impurities, Mesalamine

Mesalamine impurity J

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CAS No.

: 112725-89-0

Mol F.

: C₇H₈N₂O₃

Mol W.

: 168.15

Cat No.

: SA21309

Impurities, Mesalamine

Mesalamine impurity K

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CAS No.

: 62-53-3

Mol F.

: C₆H₇N

Mol W.

: 93.13

Cat No.

: SA21310

Impurities, Mesalamine

Mesalamine impurity L

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CAS No.

: 118-91-2

Mol F.

: C₇H₅ClO₂

Mol W.

: 156.57

Cat No.

: SA21311

Impurities, Mesalamine

Mesalamine impurity M

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CAS No.

: 2516-96-3

Mol F.

: C₇H₄ClNO₄

Mol W.

: 201.56

Cat No.

: SA21312

Impurities, Mesalamine

Mesalamine impurity N

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CAS No.

: 96-97-9

Mol F.

: C₇H₅NO₅

Mol W.

: 183.12

Cat No.

: SA21313

Impurities, Mesalamine

Mesalamine impurity O

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CAS No.

: 121-57-3

Mol F.

: C₆H₇NO₃S

Mol W.

: 173.19

Cat No.

: SA21314

Impurities, Mesalamine

Mesalamine impurity Q

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CAS No.

: 3970-35-2

Mol F.

: C₇H₄ClNO₄

Mol W.

: 201.56

Cat No.

: SA21316

Impurities, Mesalamine

Mesalamine impurity R

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CAS No.

: 85-38-1

Mol F.

: C₇H₅NO₅

Mol W.

: 183.12

Cat No.

: SA21317

Impurities, Metformin

Metformin

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CAS No.

: 1115-70-4 (HCl salt); 657-24-9 (base)

Mol F.

: C4H12ClN5

Mol W.

: 165.62

Cat No.

: SA27506

Impurities, Metformin

Metformin EP Impurity B

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CAS No.

: 2959-04-8(HClsalt);4405-08-7(base)

Mol F.

: C4H8N8

Mol W.

: 168.16

Cat No.

: SA27501

Impurities, Metformin

Metformin EP Impurity F

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CAS No.

: 506-59-2

Mol F.

: C2H8ClN

Mol W.

: 81.54

Cat No.

: SA27505

Cefadroxil, Impurities

Methoxy Cefadroxil

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CAS No.

: NA

Mol F.

: C17H19N3O6S

Mol W.

: 393.4

Cat No.

: SA42303

Colesevelam, Impurities

Methoxyquat Iodide

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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

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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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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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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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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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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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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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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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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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CAS No.

Mol F.

: C15H16N2O3

Mol W.

: 272.30

Cat No.

: SA121112

Impurities, Terbinafine

Methyl 2,2-dimethyl-3-butynoate

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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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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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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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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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CAS No.

: 3027550-97-3

Mol F.

: C22H27N7O2

Mol W.

: 421.51

Cat No.

: SA47107

Brinzolamide, Impurities

Methyl Brinzolamide Impurity

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CAS No.

: 138890-58-1

Mol F.

: C9H15N3O4S3

Mol W.

: 325.4

Cat No.

: SA47207

Flurbiprofen, Impurities

Methyl Flurbiprofen

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CAS No.

: 66202-86-6

Mol F.

: C16H15FO2

Mol W.

: 258.29

Cat No.

: SA14614