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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, Zolpidem

Zolpidem Impurity C

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CAS No.

: 4619-20-9

Mol F.

: C11H12O3

Mol W.

: 192.21

Cat No.

: SA43009

Impurities, Zolpidem

Zolpidem Impurity D

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CAS No.

: 836627-56-6

Mol F.

: C₁₃H₁₆BrNO₂

Mol W.

: 298.18

Cat No.

: SA43008

Impurities, Zolpidem

Zolpidem Impurity E

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CAS No.

: 83192-85-2

Mol F.

: C₁₃H₁₅NO₂

Mol W.

: 217.26

Cat No.

: SA43007

Impurities, Zolpidem

Zolpyridine

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CAS No.

: 349122-64-1

Mol F.

: C14H14N2O

Mol W.

: 226.27

Cat No.

: SA43003

Impurities, Zopiclone

Zopiclone

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CAS No.

: 43200-80-2

Mol F.

: C17H17ClN6O3

Mol W.

: 388.81

Cat No.

: SA38700

Impurities, Zopiclone

Zopiclone EP impurity A

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CAS No.

: 43200-96-0

Mol F.

: C17H17ClN6O4

Mol W.

: 404.81

Cat No.

: SA38701

Impurities, Zopiclone

Zopiclone EP impurity B

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CAS No.

: 43200-81-3

Mol F.

: C11H7ClN2O4

Mol W.

: 262.65

Cat No.

: SA38702

Impurities, Zopiclone

Zopiclone EP impurity C

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CAS No.

: 148891-53-6

Mol F.

: C11H7ClN4O

Mol W.

: 246.65

Cat No.

: SA38703

Impurities, Levothyroxine

α-Amino-4-hydroxy-3,5-diiodo-benzeneacetic Acid

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CAS No.

: 854646-83-6

Mol F.

: C8H7I2NO3

Mol W.

: 418.96

Cat No.

: SA24726

Flurbiprofen, Impurities

α-Desmethyl 3’,4’-Dimethoxy Flurbiprofen

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CAS No.

: 1346604-78-1

Mol F.

: C16H14FO4

Mol W.

: 290.29

Cat No.

: SA14611

Flurbiprofen, Impurities

α-desmethyl Flurbiprofen

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CAS No.

: 5001-96-7

Mol F.

: C14H11FO2

Mol W.

: 230.23

Cat No.

: SA14618

Impurities, Levothyroxine

α-Hydroxy-4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-N-methyl-benzeneacetamide

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CAS No.

: 2088032-68-0

Mol F.

: C15H11I4NO4

Mol W.

: 776.87

Cat No.

: SA24727

Impurities, Tiotropium

α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester

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CAS No.

: 783273-13-2

Mol F.

: C18H19NO4S2

Mol W.

: 377.48

Cat No.

: SA11718

Impurities, Tamoxifen

β-Hydroxy Tamoxifen

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CAS No.

: 97151-03-6

Mol F.

: C26H29NO2

Mol W.

: 387.51

Cat No.

: SA35513

Cephalexin, Impurities

Δ-2-7-Aminodesacetoxycephalosporanic Acid

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CAS No.

: 56487-68-4

Mol F.

: C8H10N2O3S

Mol W.

: 214.24

Cat No.

: SA12011

Ethinylestradiol, Impurities

Δ-6(7)-18-Methyl Ethinylestradiol

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CAS No.

: 1175128-91-2

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA13113

Estradiol Valerate, Impurities

δ-6(7)-Dehydroestradiol divalerate

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CAS No.

Mol F.

: C28H38O4

Mol W.

: 438.6

Cat No.

: SA14011

Estrone, Impurities

δ-6(7)-Estrone

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CAS No.

: 2208-12-0

Mol F.

: C18H20O2

Mol W.

: 268.35

Cat No.

: SA16012

Impurities, Nandrolone

δ-6(7)-Nandrolone

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CAS No.

: 14531-84-1

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA16304

Estrone, Impurities

δ-8(9)-Dehydroestrone

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CAS No.

: 474-87-3

Mol F.

: C18H20O2

Mol W.

: 268.3

Cat No.

: SA16003

Estrone, Impurities

δ-8(9)-Dehydroestrone Sodium Sulfate

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CAS No.

: 61612-83-7

Mol F.

: C18H19NaO5S

Mol W.

: 370.4

Cat No.

: SA16001

Estrone, Impurities

δ-9(11)-18-Methyl estrone

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CAS No.

: 19882-81-6

Mol F.

: C19H22O2

Mol W.

: C19H22O2

Cat No.

: SA16008

Estradiol Valerate, Impurities

δ-9(11)-Dehydroestradiol-3,17b-divalerate

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CAS No.

: 1373116-15-4

Mol F.

: C28H38O4

Mol W.

: 438.6

Cat No.

: SA14014

Estrone, Impurities

δ-9(11)-Dehydroestrone

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CAS No.

: 1089-80-1

Mol F.

: C18H20O2

Mol W.

: 268.4

Cat No.

: SA16004

Estrone, Impurities

δ-9(11)-Estrone sulfate piperazine salt

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CAS No.

: 1313382-30-7

Mol F.

: C22H30N2O5S

Mol W.

: C22H30N2O5S

Cat No.

: SA16002

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone

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CAS No.

: 34184-82-2

Mol F.

: C21H28O3

Mol W.

: 328.44

Cat No.

: SA38408

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone Acetate

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CAS No.

: 130145-14-1

Mol F.

: C24H30O4

Mol W.

: 382.49

Cat No.

: SA38409

Impurities, Progesterone

Δ8,9-Progeterone

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CAS No.

: 83603-61-6

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18020

Eplerenone, Impurities

Δ9-Canrenone

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CAS No.

: 95716-71-5

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA41803

Atropine, Impurities

ψ-Tropine

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CAS No.

: 135-97-7

Mol F.

: C8H15NO

Mol W.

: 141.21

Cat No.

: SA47708

Tetrabenazine

(+/-) Tetrabenazine

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CAS No.

: 58-46-8

Mol F.

: C19H27NO3

Mol W.

: 317.4

Cat No.

: SA53900

Tenofovir

(Z)-9-Propenyladenine

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CAS No.

: 1464851-21-5

Mol F.

: C8H9N5

Mol W.

: 175.2

Cat No.

: SA36942

Tenofovir

2-Bromopropyl Adenine

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CAS No.

: NA

Mol F.

: C8H10BrN5

Mol W.

: 256.1

Cat No.

: SA36943

Nicotine

3-Pyridinecarboxaldehyde

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CAS No.

: 500-22-1

Mol F.

: C6H5NO

Mol W.

: 107.11

Cat No.

: SA32213

Alogliptin

Alogliptin N-Nitrosoglycine Impurity

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CAS No.

: NA

Mol F.

: C20H22N6O5

Mol W.

: 426.4

Cat No.

: SA54131

Amlodipine

Amlodipine Besylate

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CAS No.

: 111470-99-6

Mol F.

: C20H25ClN2O5.C6H6O3S

Mol W.

: 567.05

Cat No.

: SA30524

Amlodipine

Amlodipine Glucose and Galactose Adduct (1:1)

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CAS No.

Mol F.

Mol W.

Cat No.

: SA30525

Clopidogrel

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CAS No.

: 113665-84-2

Mol F.

: C16H16ClNO2S

Mol W.

: 321.8

Cat No.

: SA54000

Dolutegravir

Dolutegravir Carbamate Impurity

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CAS No.

: 2244161-73-5

Mol F.

: C28H24F4N4O6

Mol W.

: 588.5

Cat No.

: SA20234

Impurities, Intermediates

Linezolid Desacetamide Hydroxy Impurity; Cas: NA

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Not Available

CAS No.

: 168828-82-8

Mol F.

: C14H17FN2O4

Mol W.

: 296.29

Cat No.

: SRC900023

Impurities, Ritlecitinib

N-((3R)-1-benzyl-6-methylpiperidin-3-yl)-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine

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Not Available

CAS No.

Mol F.

: C26H29N5O2S

Mol W.

: 475.61

Cat No.

: SA50009

Pirfenidone

Pirfenidone EP Impurity C

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CAS No.

: 108-95-2

Mol F.

: C6H6O

Mol W.

: 94.11

Cat No.

: SA37203

Pirfenidone

Pirfenidone EP Impurity D

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CAS No.

: 108-86-1

Mol F.

: C6H5Br

Mol W.

: 157.01

Cat No.

: SA37204

Tenofovir

Tenofovir 9-Propenyl Impurity

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CAS No.

: 4121-39-5

Mol F.

: C8H9N5

Mol W.

: 175.2

Cat No.

: SA36941