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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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Esmolol, Impurities, Nitrosamine Impurity Standards

N-Ethyl Esmolol Nitroso Impurity

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CAS No.

: NA

Mol F.

: C15H22N2O5

Mol W.

: 310.4

Cat No.

: SA72207

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 Impurity Standards

N-Ethyl-N-(2-hydroxyethyl)nitrosamine

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CAS No.

: 13147-25-6

Mol F.

: C4H10N2O2

Mol W.

: 118.1

Cat No.

: SA446172

Impurities, Nitrosamine Impurity Standards

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 Impurity Standards

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 Impurity Standards

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

Fluoxetine

N-Formyl Fluoxetine

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CAS No.

: 199188-97-1

Mol F.

: C18H18F3NO2

Mol W.

: 337.3

Cat No.

: SA66413

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

Mirabegron

N-Formyl Mirabegron

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CAS No.

: 2865161-72-2

Mol F.

: C22H24N4O3S

Mol W.

: 424.52

Cat No.

: SA53112

Impurities, Nebivolol

N-Formyl Nebivolol

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CAS No.

: NA

Mol F.

: C23H25F2NO5

Mol W.

: 433.45

Cat No.

: SA14716

Impurities, Pregabalin

N-Formyl Pregabalin

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CAS No.

: 1488274-42-5

Mol F.

: C9H17NO3

Mol W.

: 187.2

Cat No.

: SA24845

Ribociclib

N-Formyl Ribociclib Impurity

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CAS No.

: 2460732-08-3

Mol F.

: C24H30N8O2

Mol W.

: 462.56

Cat No.

: SA47105

Impurities, Risdiplam

N-Formyl Risdiplam Impurity

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CAS No.

: NA

Mol F.

: C23H23N7O2

Mol W.

: 429.5

Cat No.

: SA52307

Impurities, Sertraline

N-Formyl Sertraline

$220.00 25 mg

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CAS No.

: 147250-57-5

Mol F.

: C18H17Cl2NO

Mol W.

: 334.23

Cat No.

: SA36519

Impurities, Sitagliptin

N-Formyl Sitagliptin

$395.00 25 mg

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CAS No.

Mol F.

: C17H15F6N5O2

Mol W.

: 435.32

Cat No.

: SA10423

Impurities, Trimetazidine

N-Formyl Trimetazidine Impurity

$195.00 100 mg

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CAS No.

: 879646-17-0

Mol F.

: C15H22N2O4

Mol W.

: 294.35

Cat No.

: SA35112

Impurities, Nicotine

N-Formylnornicotine

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CAS No.

: 3000-81-5

Mol F.

: C₁₀H₁₂N₂O

Mol W.

: 176.22

Cat No.

: SA32211

Impurities, Lenalidomide

N-Glucoside Lenalidomide Impurity

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CAS No.

: NA

Mol F.

: C19H23N3O8

Mol W.

: 421.4

Cat No.

: SA34101

Fingolimod, Impurities

N-Hydroxy Fingolimod Impurity

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CAS No.

: NA

Mol F.

: C19H33NO3

Mol W.

: 323.47000000000003

Cat No.

: SA34516

Impurities, Lenalidomide

N-Hydroxy Lenalidomide Impurity

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CAS No.

: NA

Mol F.

: C₁₃H₁₃N₃O₄

Mol W.

: 275.26

Cat No.

: SA34102

Metamizole

N-Hydroxy Metamizole EP Impurity C

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CAS No.

: NA

Mol F.

: C12H15N3O2

Mol W.

: 233.3

Cat No.

: SA81405

Emtricitabine, Impurities

N-Hydroxy methyl Emtricitabine

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CAS No.

: NA

Mol F.

: C9H12FN3O4S

Mol W.

: 277.3

Cat No.

: SA22946

Impurities, Palbociclib

N-Hydroxy Palbociclib

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CAS No.

: 2231085-26-8

Mol F.

: C24H29N7O3

Mol W.

: 463.53

Cat No.

: SA40409

Impurities, Risdiplam

N-Hydroxy Risdiplam Impurity | CAS : 2250441-24-6

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CAS No.

: 2250441-24-6

Mol F.

: C22H23N7O2

Mol W.

: 417.46

Cat No.

: SA52309

Impurities, Sulfamethoxazole

N-Hydroxy Sulfamethoxazole

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CAS No.

: 114438-33-4

Mol F.

: C10H11N3O4S

Mol W.

: 269.28

Cat No.

: SA25506

Carvedilol, Impurities

N-Isopropyl Carvedilol

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CAS No.

: 1246819-01-1

Mol F.

: C₂₇H₃₂N₂O₄

Mol W.

: 448.55

Cat No.

: SA31710

Duloxetine, Impurities

N-Methyl Duloxetine (Racemic)

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CAS No.

: 116817-11-9

Mol F.

: C19H21NOS

Mol W.

: 311.44

Cat No.

: SA36323

Fluoxetine

N-Methyl Fluoxetine

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CAS No.

: 56225-81-1

Mol F.

: C18H20F3NO

Mol W.

: 323.4

Cat No.

: SA66414

Fluoxetine

N-Methyl Fluoxetine (HCl salt)

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CAS No.

: 885101-12-2

Mol F.

: C18H20F3NO : HCl

Mol W.

: 323.4 : 36.5

Cat No.

: SA66415

Fluoxetine

N-Methyl Fluoxetine (Oxalate salt)

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CAS No.

: 2972441-71-5

Mol F.

: C18H20F3NO : C2H2O4

Mol W.

: 323.4 : 90.0

Cat No.

: SA66416

Impurities, Lenalidomide

N-Methyl Lenalidomide Impurity

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CAS No.

: 2197421-58-0

Mol F.

: C14H15N3O3

Mol W.

: 273.29000000000002

Cat No.

: SA34103

Impurities, Omeprazole

N-Methyl Omeprazole (Mixture of Isomers)

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CAS No.

: 784143-42-6

Mol F.

: C18H21N3O3S

Mol W.

: 359.44

Cat No.

: SA19417

Impurities, Paroxetine

N-Methyl Paroxetine

$99.00 25 mg

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CAS No.

: 110429-36-2

Mol F.

: C20H22FNO3

Mol W.

: 343.4

Cat No.

: SA18316

Pioglitazone

N-Methyl Pioglitazone Impurity | CAS : 1333110-79-4

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CAS No.

: 1333110-79-4

Mol F.

: C20H22N2O3S

Mol W.

: 370.5

Cat No.

: SA52817

Impurities, Tamsulosin

N-Methyl Tamsulosin Impurity

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CAS No.

: 2749357-76-2

Mol F.

: C21H30N2O5S

Mol W.

: 422.5

Cat No.

: SA77910

Ganciclovir, Impurities

N-Methyl Valganciclovir Hydrochloride

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CAS No.

: 1401562-16-0

Mol F.

: C₁₅H₂₄N₆O₅.HCl

Mol W.

: 368.39

Cat No.

: SA13717

Impurities, Varenicline

N-methyl varenicline Impurity

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CAS No.

: 328055-92-1

Mol F.

: C14H15N3

Mol W.

: 225.29

Cat No.

: SA39510

Impurities, Viloxazine

N-Methyl Viloxazine

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CAS No.

: 48173-47-3

Mol F.

: C14H21NO3

Mol W.

: 251.3

Cat No.

: SA23504

Zonisamide

N-Methyl Zonisamide

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CAS No.

: 68292-02-4

Mol F.

: C9H10N2O3S

Mol W.

: 226.3

Cat No.

: SA80603

Impurities, Nitrosamine Impurity Standards

N-Methyl-4-Nitro-N-Nitrosoaniline

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CAS No.

: 943-41-9

Mol F.

: C7H7N3O3

Mol W.

: 181.15

Cat No.

: SA446148

Impurities, Nitrosamine Impurity Standards

N-Methyl-N-(4-oxobutyl)nitrous Amide

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CAS No.

: 339362-86-6

Mol F.

: C5H10N2O2

Mol W.

: 130.15

Cat No.

: SA446116

Impurities, Nitrosamine Impurity Standards

N-Methyl-N-Nitroso Benzylamine

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CAS No.

: 937-40-6

Mol F.

: C8H10N2O

Mol W.

: 150.2

Cat No.

: SA446127

Impurities, Nitrosamine Impurity Standards

N-Methyl-N-nitroso-2-propanamine

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CAS No.

: 30533-08-5

Mol F.

: C4H10N2O

Mol W.

: 102.14

Cat No.

: SA44645

Impurities, Nitrosamine Impurity Standards

N-methyl-N-phenylnitrous amide

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CAS No.

: 614-00-6

Mol F.

: C7H8N2O

Mol W.

: 136.15

Cat No.

: SA446107

Impurities, Saxagliptin

N-methylcyanamide Saxagliptin carboxylic acid Impurity

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CAS No.

: NA

Mol F.

: C19H25N3O4

Mol W.

: 359.42

Cat No.

: SA27408

Alimemazine, Impurities

N-Nitoso Alimemazine EP Impurity B

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CAS No.

: NA

Mol F.

: C17H19N3OS

Mol W.

: 313.4

Cat No.

: SA55904

Impurities, Linagliptin, Nitrosamine Impurity Standards

N-Nitoso Linagliptin N-Alkyl Dimer Impurity

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CAS No.

: NA

Mol F.

: C51H55N17O5

Mol W.

: 986.09

Cat No.

: SA49954