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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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Fingolimod, Impurities

N-Acetyl Diethyl Ester Fingolimod Impurity

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CAS No.

: 162358-08-9

Mol F.

: C25H39NO5

Mol W.

: 433.58

Cat No.

: SA34514

Dorzolamide, Impurities

N-Acetyl Dorzolamide

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CAS No.

: 403848-09-9

Mol F.

: C12H18N2O5S3

Mol W.

: 366.48

Cat No.

: SA24115

Impurities, Penciclovir

N-acetyl esterified Impurity

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CAS No.

: NA

Mol F.

: C16H20ClN5O5

Mol W.

: 397.81

Cat No.

: SA27709

Ganciclovir, Impurities

N-Acetyl-di-O-acetyl Ganciclovir

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CAS No.

: 86357-14-4

Mol F.

: C₁₅H₁₉N₅O₇

Mol W.

: 381.34

Cat No.

: SA13704

Building Blocks, Impurities

N-Acetyl-DL-Tryptophan

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CAS No.

: 87-32-1

Mol F.

: C13H14N2O3

Mol W.

: 246.3

Cat No.

: SB10727

Impurities, Linagliptin

N-Aminoacyl Linagliptin

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CAS No.

: 2983074-55-9

Mol F.

: C26H29N9O3

Mol W.

: 515.6

Cat No.

: SA49918

Impurities, Lenalidomide

N-Aminopropanoyl Lenalidomide Impurity

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CAS No.

: NA

Mol F.

: C16H18N4O4

Mol W.

: 330.34

Cat No.

: SA34106

Impurities, Sitagliptin

N-Benzyl carbamate Sitagliptin

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CAS No.

Mol F.

: C24H19F6N5O4

Mol W.

: 555.43

Cat No.

: SA10430

Ciprofloxacin, Impurities

N-Benzyl Ciprofloxacin Benzyl Ester

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CAS No.

: 1391052-64-4

Mol F.

: C31h30FN3O3

Mol W.

: 511.59

Cat No.

: SA42009

Impurities, Nitrosamine

N-Benzyl-N-ethylnitrous amide

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CAS No.

: 20689-96-7

Mol F.

: C9H12N2O

Mol W.

: 164.2

Cat No.

: SA44695

Impurities, Isavuconazole

N-Boc Isavuconazonium Impurity

$400.00 25 mg

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CAS No.

: 338990-63-9; 741241-71-4 (free base); 338990-64-0 (Iodide salt)

Mol F.

: C40H43ClF2N8O7S

Mol W.

: 853.33

Cat No.

: SA44116

Impurities, Venlafaxine

N-Boc N,O-Didesmethylvenlafaxine

$1,555.00 100 mg

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CAS No.

: 1076199-24-0

Mol F.

: C20H31NO4

Mol W.

: 349.46

Cat No.

: SA22721

Impurities, Risdiplam

N-Boc Risdiplam | CAS : 2133298-74-3

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CAS No.

: 2133298-74-3

Mol F.

: C27H31N7O3

Mol W.

: 501.58

Cat No.

: SA52310

Impurities, Saxagliptin

N-Boc-L-cis-4,5-Methanoprolineamide

$195.00 1 g

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CAS No.

: 361440-67-7

Mol F.

: C11H18N2O3

Mol W.

: 226.27

Cat No.

: SA27401

Dapoxetine, Impurities

N-Boc-N-desmethyl Dapoxetine

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CAS No.

Mol F.

: C25H29NO3

Mol W.

: 391.5

Cat No.

: SA23005

Brexpiprazole, Impurities

N-butyl bromide Quinolinone

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CAS No.

: NA

Mol F.

: C13H14BrNO2

Mol W.

: 296.16

Cat No.

: SA41309

Eslicarbazepine, Impurities

N-Carbamoyl Oxcarbazepine

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CAS No.

Mol F.

: C16H13N3O3

Mol W.

: 295.29

Cat No.

: SA28804

Ganciclovir, Impurities

N-Carbobenzyloxy-L-valinyl-ganciclovir

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CAS No.

: 194154-40-0

Mol F.

: C₂₂H₂₈N₆O₇

Mol W.

: 488.49

Cat No.

: SA13702

Ciprofloxacin, Impurities

N-Cyclopropy Analog

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CAS No.

: 1502292-84-3

Mol F.

: C10H12FNO

Mol W.

: 181.21

Cat No.

: SA42011

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, 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

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

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, Terbinafine

N-Desmethyl cis-Terbinafine

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CAS No.

: 114311-72-7

Mol F.

: C20H23N

Mol W.

: 277.70999999999998

Cat No.

: SA25720

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

Impurities, Lercanidipine, Nitrosamine

N-Desmethyl Lercanidipine N-Nitroso

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CAS No.

Mol F.

: C35H38N4O7

Mol W.

: 626.7

Cat No.

: SA50917

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

Impurities, Nitrosamine, 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

Impurities, Ondansetron

N-Desmethyl Ondansetron

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CAS No.

: 9614-14-9

Mol F.

: C17H17N3O

Mol W.

: 279.33999999999997

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, 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

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

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

Pioglitazone

N-Ethyl Pioglitazone Impurity | CAS : 1333110-38-5

$995.00 100 mg

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CAS No.

: 1333110-38-5

Mol F.

: C21H24N2O3S

Mol W.

: 384.5

Cat No.

: SA52816

Impurities, Nitrosamine

N-Ethyl-N-(3-carboxypropyl)nitrosamine

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CAS No.

: 54897-63-1

Mol F.

: C6H12N2O3

Mol W.

: 160.16999999999999

Cat No.

: SA44648

Impurities, Nitrosamine

N-ethyl-N-isopropylnitrous amide

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CAS No.

: 16339-04-1

Mol F.

: C5H12N2O

Mol W.

: 116.16

Cat No.

: SA44602

Impurities, Nitrosamine

N-Ethyl-N-Nitroso Aniline

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CAS No.

: 612-64-6

Mol F.

: C8H10N2O

Mol W.

: 150.18

Cat No.

: SA446123

Impurities, Sumatriptan

N-Ethylisopropylamine

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CAS No.

: 19961-27-4

Mol F.

: C5H13N

Mol W.

: 87.2

Cat No.

: SA33319

Atomoxetine, Impurities

N-Formyl Atomoxetine

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CAS No.

: NA

Mol F.

: C18H21NO2

Mol W.

: 283.36

Cat No.

: SA22117

Fingolimod, Impurities

N-Formyl Fingolimod Impurity

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CAS No.

: NA

Mol F.

: C20H33NO3

Mol W.

: 335.48

Cat No.

: SA34515

Impurities, Lenalidomide

N-Formyl Lenalidomide Impurity

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CAS No.

: 2197414-56-3

Mol F.

: C14H13N3O4

Mol W.

: 287.27

Cat No.

: SA34107

Impurities, Pregabalin

N-Formyl Pregabalin

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CAS No.

: 1488274-42-5

Mol F.

: C9H17NO3

Mol W.

: 187.2

Cat No.

: SA24845

Impurities, Risdiplam

N-Formyl Risdiplam Impurity

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CAS No.

: NA

Mol F.

: C23H23N7O2

Mol W.

: 429.5

Cat No.

: SA52307