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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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Carbamazepine, Impurities

10-Bromo Oxcarbazepine

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CAS No.

: 113952-20-8

Mol F.

: C15H11BrN2O2

Mol W.

: 331.16

Cat No.

: SA20333

Carbamazepine, Impurities

10-Chloro Carbamazepine

$95.00 25 mg

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CAS No.

: 59690-92-5

Mol F.

: C15H11ClN2O

Mol W.

: 270.71

Cat No.

: SA20316

Impurities, Promethazine

10-Methylphenothiazine

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CAS No.

: 1207-72-3

Mol F.

: C13H11NS

Mol W.

: 213.3

Cat No.

: SA42905

Carbamazepine, Impurities

10-Oxo carbazepine

$95.00 25 mg

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CAS No.

: 28721-07-5

Mol F.

: C15H12N2O2

Mol W.

: 252.27

Cat No.

: SA20324

Carbamazepine, Impurities

10,11-Dichloro-10,11-dihydro-5H-dibenz[b,f]azepine-5-carboxamide

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CAS No.

: 59690-98-1

Mol F.

: C15H12Cl2N2O

Mol W.

: 307.17

Cat No.

: SA20338

Carbamazepine, Impurities

10,11-Dihydro-10-hydroxy Carbamazepine

$95.00 25 mg

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CAS No.

: 29331-92-8

Mol F.

: C15H14N2O2

Mol W.

: 254.28

Cat No.

: SA20320

Impurities, Naloxone

10α-Hydroxynaloxone

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CAS No.

: 2139253-68-0

Mol F.

: C19H21NO5

Mol W.

: 343.37

Cat No.

: SA45108

Impurities, Norethindrone

10β-Hydroperoxy Norethindrone Acetate

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CAS No.

: 13236-11-8

Mol F.

: C22H28O5

Mol W.

: 372.45

Cat No.

: SA13431

Impurities, Levonorgestrel

10β-Hydroxy Levonorgestrel

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CAS No.

: 21508-50-9

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23727

Impurities, Norethindrone

10β-Hydroxy Norethindrone

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CAS No.

: 1236-00-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA13417

19-Norandrostenedione, Impurities

10β-Hydroxy-19-norandrostene-3,17-dione

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CAS No.

: 5189-96-8

Mol F.

: C18H24O3

Mol W.

: 288.4

Cat No.

: SA15801

Eslicarbazepine, Impurities

11-acetyl-6H-benzo[b][1]benzazepin-5-one

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CAS No.

: 28291-63-6

Mol F.

: C16H13NO2

Mol W.

: 251.28

Cat No.

: SA28802

Hydrocortisone Valerate, Impurities

11-Epi-Hydrocortisone-17-valerate

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CAS No.

: 139755-29-6

Mol F.

: C26H38O6

Mol W.

: 446.58

Cat No.

: SA27307

Impurities, Oxcarbazepine

11-Hydroxy-5H-dibenzo[b,f]azepin-10(11H)-one

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CAS No.

Mol F.

: C₁₄H₁₁NO₂

Mol W.

: 225.24

Cat No.

: SA12518

Halcinonide, Impurities

11-Keto halcinonide

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CAS No.

: NA

Mol F.

: C24H30ClFO5

Mol W.

: 452.94

Cat No.

: SA30402

Impurities, Methylprednisolone

11-Keto MethylPrednisolone Succinate

$255.00 25 mg

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CAS No.

Mol F.

: C26H32O8

Mol W.

: 472.53

Cat No.

: SA14415

Betamethasone Dipropionate, Impurities

11-Oxo-betamethasone Dipropionate

$175.00 25 mg

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CAS No.

: 64967-90-4

Mol F.

: C28H35FO7

Mol W.

: 502.57

Cat No.

: SA14513

Fluticasone Furoate, Impurities

11-Oxo-fluticasone Furoate Impurity

$350.00 25 mg

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CAS No.

: 397864-57-2

Mol F.

: C26H26F2O6S

Mol W.

: 504.54

Cat No.

: SA48210

Fluticasone Propionate, Impurities

11-Oxo-fluticasone Furoate Impurity

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CAS No.

: 397864-57-2

Mol F.

: C26H26F2O6S

Mol W.

: 504.54

Cat No.

: SA47021

Impurities, Oxcarbazepine

11,11-Dichloro Oxcarbazepine

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CAS No.

: 1798004-39-3

Mol F.

: C15H10Cl2N2O2

Mol W.

: 32.16

Cat No.

: SA12515

Impurities, Methylprednisolone

11ß,17,20-Trihydroxy-6a-methyl-3-oxo-pregna-1,4-dien-21-yl acetate

$195.00 25 mg

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CAS No.

: 151003-82-6

Mol F.

: C24H34O6

Mol W.

: 418.52

Cat No.

: SA14421

Impurities, Progesterone

11α-Hydroxy Progesterone

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CAS No.

: 80-75-1

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18017

Impurities, Methylprednisolone Acetate

11β,17α-Dihydroxy-17β-formyl-6α-methylandrosta-1,4-diene-3-one

$395.00 25 mg

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CAS No.

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA25008

Impurities, Progesterone

15β-Hydroxy Progesterone

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CAS No.

: 600-72-6

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18018

Impurities, Prednisone

16-Dehydro 17-Dehydroxy Prednisone

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CAS No.

: 102447-86-9

Mol F.

: C21H24O4

Mol W.

: 340.41

Cat No.

: SA26216

Exemestane, Impurities

16-Methylene 1,2-Dihydro Exemestane

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CAS No.

: NA

Mol F.

: C21H26O2

Mol W.

: 310.44

Cat No.

: SA19119

Desoximetasone, Impurities

16,17-Didehydro 16-Demethyl Desoximetasone

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CAS No.

: 1234572-33-8

Mol F.

: C21H25FO4

Mol W.

: 360.42

Cat No.

: SA19205

Impurities, Prednisone

16,21-Didehydro 17-Dehydroxy Prednisone

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CAS No.

: NA

Mol F.

: C21H22O4

Mol W.

: 338.4

Cat No.

: SA26209

Impurities, Progesterone

16α-Hydroxy Progesterone

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CAS No.

: 438-07-3

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18019

Flunisolide, Impurities

16α-Hydroxy-6α-fluoroprednisolone

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CAS No.

: 3915-36-4

Mol F.

: C21H27FO6

Mol W.

: 394.43

Cat No.

: SA47507

Impurities, Methylprednisolone

16α-MethylPrednisolone

$155.00 25 mg

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CAS No.

: 10417-63-7

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA14420

Impurities, Methylprednisolone

16α-Methylprednisolone 21-Acetate

$555.00 25 mg

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CAS No.

: 13209-52-4

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14419

Exemestane, Impurities

16α, 17α-Epoxy Exemestane Impurity

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CAS No.

: NA

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19114

Halcinonide, Impurities

16α,17α-Dihydroxy Halcinonide

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CAS No.

: 982-91-2

Mol F.

: C21H28ClFO5

Mol W.

: 414.89

Cat No.

: SA30401

Ethinylestradiol, Impurities

16α,17α-Epoxy-19-norpregna-1,3,5(10)-trien-20-yn-3-ol Acetate

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CAS No.

: 55812-84-5

Mol F.

: C22H24O3

Mol W.

: 336.42

Cat No.

: SA13134

Ethisterone, Impurities

16β-Hydroxy-17-epi-norethisterone

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CAS No.

Mol F.

: C₂₀H₂₆O₃

Mol W.

: 314.42

Cat No.

: SA12902

Ethinylestradiol, Impurities

16β-Hydroxy-17α-Ethinylestradiol

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CAS No.

: 10084-25-0

Mol F.

: C20H24O3

Mol W.

: 312.41

Cat No.

: SA13116

Dutasteride, Impurities

17-carboxamide Dutasteride

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CAS No.

: 104214-61-1

Mol F.

: C19H28N2O2

Mol W.

: 316.44

Cat No.

: SA35213

Difluoroprednisolone, Impurities

17-Dehydroxy-17-des(hydroxyacetyl)-17β-methyl-6α,9α-Difluoroprednisolone

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CAS No.

Mol F.

: C20H26F2O2

Mol W.

: 336.42

Cat No.

: SA14209

Ethinylestradiol, Impurities

17-Dehydroxy-dehydro 17-epi-Ethinylestradiol

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CAS No.

: 71716-18-2

Mol F.

: C20H22O

Mol W.

: 278.39

Cat No.

: SA13125

Impurities, Norethindrone

17-Desethynyl 17-Dibromomethylaceto-norethindrone Acetate

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CAS No.

: 40228-41-9

Mol F.

: C22H28Br2O4

Mol W.

: 516.26

Cat No.

: SA13430

Impurities, Loteprednol

17-Methoxycarbonyl Loteprednol

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CAS No.

: 265651-89-6

Mol F.

: C23H29ClO7

Mol W.

: 452.92

Cat No.

: SA27608

Impurities, Methylprednisolone

17-O-Acetyl-6-methylprednisolone

$295.00 25 mg

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CAS No.

: 86401-94-7

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14416

Impurities, Norethindrone

17-O-Trimethylsilyl 6,7-Dehydro Norethindrone

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CAS No.

: 300542-58-9

Mol F.

: C23H32O2Si

Mol W.

: 368.58

Cat No.

: SA13432

Impurities, Norethindrone

17-O-Trimethylsilyl Norethindrone

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CAS No.

: 28426-43-9

Mol F.

: C23H34O2Si

Mol W.

: 370.6

Cat No.

: SA13433

Beclomethasone Dipropionate, Impurities

17,21-Dihydroxy-16β-methylpregna-1,4-diene-3,20-dione Dipropionate

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CAS No.

Mol F.

: C28H38O6

Mol W.

: 470.6

Cat No.

: SA15617

Equilin, Impurities

17α-Dihydro Equilin

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CAS No.

: 651-55-8

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA16402

Ethinylestradiol, Impurities

17α-Dihydro-17β-ethinyl-equillenin

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CAS No.

Mol F.

: C20H20O2

Mol W.

: 292.37

Cat No.

: SA13133

Impurities, Norethindrone

17α-Ethinyl-17β-acetoxy-3,5-estradiene

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CAS No.

: 64850-62-0

Mol F.

: C22H28O2

Mol W.

: 324.46

Cat No.

: SA13434

Ethinylestradiol, Impurities

17α-Ethinylestradiol

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CAS No.

: 57-63-6

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA13117