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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, Vildagliptin

Vildagliptin N-Oxide

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CAS No.

Mol F.

: C17H25N3O3

Mol W.

: 319.4

Cat No.

: SA23913

Impurities, Vortioxetine

Vortioxetine 3-Bromo Impurity | CAS : 2725536-50-3

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CAS No.

: 2725536-50-3 (Free base)

Mol F.

: C18H21BrN2S

Mol W.

: 377.3

Cat No.

: SA50304

Impurities, Vortioxetine

Vortioxetine 4-Thiophenyl Impurity | CAS : 1815608-51-5

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CAS No.

: 1815608-51-5

Mol F.

: C18H22N2S

Mol W.

: 298.4

Cat No.

: SA50303

Impurities, Vortioxetine

Vortioxetine Desmethyl Impurity

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CAS No.

: 508234-03-5

Mol F.

Mol W.

Cat No.

: SA50305

Impurities, Vortioxetine

Vortioxetine m-Tolylthiophenyl Impurity

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CAS No.

: 1293342-89-8

Mol F.

: C17H21ClN2S

Mol W.

: 320.88

Cat No.

: SA50306

Impurities, Norgestimate

Z-17-Deacetylnorgestimate

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CAS No.

: 74183-54-3

Mol F.

: C21H29NO2

Mol W.

: 327.5

Cat No.

: SA15903

Impurities, Zidovudine

Zidovudine

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CAS No.

: 30516-87-1

Mol F.

: C10H13N5O4

Mol W.

: 267.24

Cat No.

: SA12603

Impurities, Zidovudine

Zidovudine EP Impurity D

$75.00 25 mg

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CAS No.

: 76-84-6

Mol F.

: C19H16O

Mol W.

: 260.33

Cat No.

: SA12606

Impurities, Zidovudine

Zidovudine EP Impurity J

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CAS No.

: 29706-84-1

Mol F.

: C29H27N5O4

Mol W.

: 509.56

Cat No.

: SA12611

Impurities, Zidovudine

Zidovudine Impurity F

$395.00 25 mg

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CAS No.

: 16053-52-4

Mol F.

: C10H14N2O5

Mol W.

: 242.23

Cat No.

: SA12609

Impurities, Zidovudine

Zidovudine USP RC D

$75.00 25 mg

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CAS No.

: 50-89-5

Mol F.

: C10H14N2O5

Mol W.

: 242.23

Cat No.

: SA12607

Impurities, Ziprasidone

Ziprasidone

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CAS No.

: 146939-27-7(Base);138982-67-9(HClSalt)

Mol F.

: C21H21ClN4OS

Mol W.

: 412.94

Cat No.

: SA32700

Impurities, Ziprasidone

Ziprasidone EP Impurity A

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CAS No.

: 87691-87-0

Mol F.

: C11H13N3S

Mol W.

: 219.31

Cat No.

: SA32701

Impurities, Ziprasidone

Ziprasidone EP Impurity B

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CAS No.

: 1159977-56-6

Mol F.

: C21H19ClN4O2S

Mol W.

: 426.92

Cat No.

: SA32702

Impurities, Ziprasidone

Ziprasidone EP Impurity C

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CAS No.

: 1159977-64-6

Mol F.

: C21H23ClN4O2S

Mol W.

: 430.95

Cat No.

: SA32703

Impurities, Ziprasidone

Ziprasidone EP Impurity D

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CAS No.

Mol F.

: C42H40Cl2N8O3S2

Mol W.

: 839.86

Cat No.

: SA32704

Impurities, Ziprasidone

Ziprasidone EP Impurity E

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CAS No.

: 1159977-04-4

Mol F.

: C28H24ClN5OS2

Mol W.

: 546.11

Cat No.

: SA32705

Impurities, Zolmitriptan

Zolmitriptan Hydroxy Ketone Analog

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CAS No.

: NA

Mol F.

: C16H21N3O4

Mol W.

: 319.4

Cat No.

: SA11911

Impurities, Nitrosamine, Zolmitriptan

Zolmitriptan N-Nitroso Indolyl Derivative

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CAS No.

: NA

Mol F.

: C16H20N4O3

Mol W.

: 316.4

Cat No.

: SA11912

Zolmitriptan

Zolmitriptan USP Related Compound D

$1,555.00 100 mg

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CAS No.

: 191864-24-1

Mol F.

: C19H25N3O4

Mol W.

: 359.42

Cat No.

: SA11906

Impurities, Zolpidem

Zolpidem

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CAS No.

: 82626-48-0;(99294-93-6Tartratesalt)

Mol F.

: C19H21N3O

Mol W.

: 307.39

Cat No.

: SA43000

Impurities, Zolpidem

Zolpidem Acid Impurity

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CAS No.

: 189005-44-5

Mol F.

: C17H16N2O2

Mol W.

: 280.32

Cat No.

: SA43004

Impurities, Zolpidem

Zolpidem Aldehyde Impurity

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CAS No.

: 400777-11-9

Mol F.

: C16H14N2O

Mol W.

: 250.3

Cat No.

: SA43005

Impurities, Zolpidem

Zolpidem EP Impurity A

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CAS No.

: 1346600-85-8

Mol F.

: C19H21N3O

Mol W.

: 307.39

Cat No.

: SA43001

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

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

$595.00 25 mg

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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