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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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Dapoxetine, Impurities

N-Demethyl Dapoxetine Hydrochloride

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CAS No.

: 119357-18-5

Mol F.

: C20H22ClNO

Mol W.

: 327.85

Cat No.

: SA23006

Impurities, Olanzapine

N-Demethyl-N-Formylolanzapine

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CAS No.

: 639460-79-0

Mol F.

: C17H18N4OS

Mol W.

: 326.4

Cat No.

: SA11501

Impurities, Linezolid

N-Desacetyl-N,O-descarbonyl O-Acetyl Linezolid

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CAS No.

: 333753-71-2

Mol F.

: C₁₅H₂₂FN₃O₃

Mol W.

: 311.35

Cat No.

: SA17509

Alverine, Impurities

N-Desethyl Alverine

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CAS No.

: 93948-20-0

Mol F.

: C18H23N

Mol W.

: 253.4

Cat No.

: SA41006

Bimatoprost

N-Desethyl Bimatoprost

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CAS No.

: 155205-89-3

Mol F.

: C23H33NO4

Mol W.

: 387.5

Cat No.

: SA62108

Brinzolamide, Impurities

N-Desethyl Brinzolamide Impurity; Brinzolamide USP Related Compound B

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CAS No.

: 404034-55-5

Mol F.

: C10H17N3O5S3

Mol W.

: 355.45

Cat No.

: SA47204

Impurities, Metoclopramide

N-Desethyl Metoclopramide

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CAS No.

: 27260-19-1

Mol F.

: C₁₂H₁₈ClN₃O₂

Mol W.

: 271.74

Cat No.

: SA30610

Impurities, Sunitinib

N-Desethyl N-Butoxycarbonyl Sunitinib

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CAS No.

: 1246833-23-7

Mol F.

: C25H31FN4O4

Mol W.

: 740.54

Cat No.

: SA39601

Vardenafil

N-Desethyl-N-Methyl Vardenafil

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CAS No.

: 224785-87-9

Mol F.

: C22H30N6O4S

Mol W.

: 474.6

Cat No.

: SA79001

Dasatinib, Impurities

N-Deshydroxyethyl Dasatinib

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CAS No.

: 910297-51-7

Mol F.

: C20H22ClN7OS

Mol W.

: 443.95

Cat No.

: SA40505

Impurities, Nitrosamine Impurity Standards, Selexipag

N-Desisopropyl N-Nitroso Selexipag

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CAS No.

: NA

Mol F.

: C23H25N5O5S

Mol W.

: 483.5

Cat No.

: SA446137

Azelastine, Impurities

N-Desmethyl Azelastine

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CAS No.

: 47491-38-3

Mol F.

: C21H22ClN3O

Mol W.

: 367.9

Cat No.

: SA54709

Binimetinib, Impurities

N-Desmethyl Binimetinib

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CAS No.

: NA

Mol F.

: C16H13BrF2N4O3

Mol W.

: 427.2

Cat No.

: SA61410

Impurities, Terbinafine

N-Desmethyl cis-Terbinafine

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CAS No.

: 114311-72-7

Mol F.

: C20H23N

Mol W.

: 277.70999999999998

Cat No.

: SA25720

Doxycycline

N-Desmethyl Doxycycline

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CAS No.

: 86271-83-2

Mol F.

: C21H22N2O8

Mol W.

: 430.4

Cat No.

: SA64807

Frovatriptan, Impurities

N-Desmethyl Frovatriptan (Racemic)

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CAS No.

: 147009-17-4

Mol F.

: C13H15N3O

Mol W.

: 229.28

Cat No.

: SA34601

Impurities, Terbinafine

N-Desmethyl hydroxy terbinafine

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CAS No.

: 162227-14-7

Mol F.

: C20H23NO

Mol W.

: 293.4

Cat No.

: SA25709

Lercanidipine

N-Desmethyl Lercanidipine Impurity

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CAS No.

: 320750-11-6

Mol F.

: C35H39N3O6

Mol W.

: 597.7

Cat No.

: SA50919

Impurities, Lercanidipine, Nitrosamine Impurity Standards

N-Desmethyl Lercanidipine N-Nitroso

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CAS No.

Mol F.

: C35H38N4O7

Mol W.

: 626.7

Cat No.

: SA50917

Lumateperone

N-Desmethyl Lumateperone N-Glucuronide

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CAS No.

: NA

Mol F.

: C29H34FN3O7

Mol W.

: 555.6

Cat No.

: SA70511

Mepyramine

N-Desmethyl Mepyramine

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CAS No.

: 104499-47-0

Mol F.

: C16H21N3O

Mol W.

: 271.4

Cat No.

: SA81705

Impurities, Mifepristone

N-Desmethyl Mifepristone

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CAS No.

: 104004-96-8

Mol F.

: C28H33NO2

Mol W.

: 415.5

Cat No.

: SA41503

Impurities, Ulipristal

N-Desmethyl N-Acetyl Ulipristal Acetate

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CAS No.

: 244206-56-2

Mol F.

: C31H37NO5

Mol W.

: 503.64

Cat No.

: SA27908

Doxepin, Impurities

N-Desmethyl N-Ethyl Doxepin

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CAS No.

: 70805-90-2

Mol F.

: C20H23NO

Mol W.

: 293.39

Cat No.

: SA29905

Impurities, Rosuvastatin

N-Desmethyl N-ethyl Rosuvastatin Sodium Salt

$1,950.00 25 mg

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CAS No.

Mol F.

: C23H29FN3NaO6S

Mol W.

: 517.55

Cat No.

: SA12139

Homatropine Hydrobromide, Impurities, Nitrosamine Impurity Standards

N-Desmethyl N-Nitroso Homatropine

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CAS No.

: NA

Mol F.

: C15H18N2O4

Mol W.

: 290.3

Cat No.

: SA92800

Impurities, Nitrosamine Impurity Standards, Olopatadine

N-Desmethyl N-Nitroso Olopatadine Carbaldehyde Impurity

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CAS No.

: NA

Mol F.

: C20H20N2O3

Mol W.

: 336.4

Cat No.

: SA91315

Impurities, Nitrosamine Impurity Standards, Olopatadine

N-Desmethyl N-Nitroso Olopatadine Isopropyl Ester

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CAS No.

: NA

Mol F.

: C23H26N2O4

Mol W.

: 394.5

Cat No.

: SA91316

Impurities, Nitrosamine Impurity Standards, Tapentadol

N-Desmethyl N-Nitroso Tapentadol

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CAS No.

: NA

Mol F.

: C13H20N2O2

Mol W.

: 236.3

Cat No.

: SA78008

Impurities, Nitrosamine Impurity Standards, Tramadol

N-Desmethyl N-Nitroso Tramadol

$995.00 100 mg

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CAS No.

: NA

Mol F.

: C15H22N2O3

Mol W.

: 278.4

Cat No.

: SA49708

Nefopam

N-Desmethyl Nefopam Hydrochloride

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CAS No.

: 46868-19-3

Mol F.

: C16H17NO

Mol W.

: 239.3

Cat No.

: SA72905

Impurities, Olanzapine

N-Desmethyl Olanzapine

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CAS No.

: 161696-76-0

Mol F.

: C16H18N4S

Mol W.

: 298.4

Cat No.

: SA11502

Impurities, Ondansetron

N-Desmethyl Ondansetron

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CAS No.

: 9614-14-9

Mol F.

: C17H17N3O

Mol W.

: 279.34

Cat No.

: SA35808

Impurities, Ribociclib

N-Desmethyl Ribociclib

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CAS No.

: 1211441-59-6

Mol F.

: C22H28N8O

Mol W.

: 420.52

Cat No.

: SA47104

Riociguat

N-Desmethyl Riociguat Ethyl Ester

$1,555.00 100 mg

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CAS No.

: 625115-49-3

Mol F.

: C20H19FN8O2

Mol W.

: 422.4

Cat No.

: SA50806

Impurities, Rivastigmine

N-Desmethyl Rivastigmine

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CAS No.

: 1070660-34-2

Mol F.

: C13H20N2O2

Mol W.

: 236.3

Cat No.

: SA76612

Impurities, Rosuvastatin

N-Desmethyl Rosuvastatin Disodium Salt Monohydrate

$750.00 25 mg

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CAS No.

: 371775-74-5(Acid)

Mol F.

: C21H23FN3Na2O7S

Mol W.

: 529.49

Cat No.

: SA12119

Impurities, Rosuvastatin

N-Desmethyl Rosuvastatin Lactone

$750.00 25 mg

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CAS No.

: 1797419-58-9

Mol F.

: C21H24FN3O5S

Mol W.

: 449.5

Cat No.

: SA12138

Impurities, Tamoxifen

N-Desmethyl Tamoxifen

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CAS No.

: 15917-65-4;31750-48-8

Mol F.

: C25H27NO

Mol W.

: 357.49

Cat No.

: SA35506

Tapentadol

N-Desmethyl Tapentadol

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CAS No.

: 1300037-83-5

Mol F.

: C13H21NO

Mol W.

: 207.3

Cat No.

: SA78006

Impurities, Ulipristal

N-Desmethyl Ulipristal

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CAS No.

: 159681-67-1

Mol F.

: C27H33NO3

Mol W.

: 419.55

Cat No.

: SA27905

Impurities, Ulipristal

N-Desmethyl Ulipristal Acetate

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CAS No.

: 159681-66-0

Mol F.

: C29H35NO4

Mol W.

: 461.59

Cat No.

: SA27903

Impurities, Vandetanib

N-Desmethyl Vandetanib

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CAS No.

: 338992-12-4

Mol F.

: C21H22BrFN4O2

Mol W.

: 461.3

Cat No.

: SA85201

Impurities, Xanomeline

N-Desmethyl Xanomeline

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CAS No.

: 131986-96-4

Mol F.

: C13H21N3OS

Mol W.

: 267.4

Cat No.

: SA54505

Doxepin, Impurities

N-Desmethyl-N-formyl Doxepin

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CAS No.

: 250331-52-3

Mol F.

: C19H19NO2

Mol W.

: 293.36

Cat No.

: SA29908

Doxylamine

N-Desmethyldoxylamine

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CAS No.

: 78868-03-8;

Mol F.

: C16H20N2O

Mol W.

: 256.4

Cat No.

: SA64707

Macitentan

N-Despropyl Macitentan Impurity

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CAS No.

: 1103522-45-7

Mol F.

: C16H14Br2N6O4S

Mol W.

: 546.2

Cat No.

: SA70810

Lidocaine

N-Dichloroacetyl-2,6-xylidine (USP)

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CAS No.

: 39084-88-3

Mol F.

: C10H11Cl2NO

Mol W.

: 232.1

Cat No.

: SA69813

Impurities, Mifepristone

N-Didesmethyl Mifepristone

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CAS No.

: 104004-92-4

Mol F.

: C27H31NO2

Mol W.

: 401.6

Cat No.

: SA41504

Esmolol

N-Ethyl Esmolol

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CAS No.

: 2469273-97-8

Mol F.

: C15H23NO4

Mol W.

: 281.4

Cat No.

: SA72204