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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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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

Impurities, Riociguat

N-Desmethyl Riociguat

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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

Impurities, Pioglitazone

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

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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

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

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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

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

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

Impurities, 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

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, Nitrosamine

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

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, Saxagliptin

N-methylcyanamide Saxagliptin carboxylic acid Impurity

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CAS No.

: NA

Mol F.

: C19H25N3O4

Mol W.

: 359.42

Cat No.

: SA27408

Impurities, Linagliptin, Nitrosamine

N-Nitoso Linagliptin N-Alkyl Dimer Impurity

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CAS No.

: NA

Mol F.

: C51H55N17O5

Mol W.

: 986.09

Cat No.

: SA49954

Impurities, Nitrosamine

N-Nitrosamine piperazine ethanol | CAS :48121-20-6

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CAS No.

: 48121-20-6

Mol F.

: C6H13N3O2

Mol W.

: 159.19

Cat No.

: SA446108

Impurities, Nitrosamine, Tranexamic Acid

N-Nitrosamine Tranexamic Acid Dimer

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CAS No.

Mol F.

: C16H26N2O5

Mol W.

: 326.39

Cat No.

: SA17409

Impurities, Nitrosamine

N-Nitroso Acetylcysteine

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CAS No.

: NA

Mol F.

: C5H8N2O4S

Mol W.

: 192.2

Cat No.

: SA446112

Amlodipine, Impurities

N-Nitroso Amlodipine

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CAS No.

Mol F.

: C20H24ClN3O6

Mol W.

: 437.88

Cat No.

: SA30518

Amoxicillin, Impurities, Nitrosamine

N-Nitroso Amoxicillin EP Impurity C

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CAS No.

: NA

Mol F.

: C16H18N4O6S

Mol W.

: 394.4

Cat No.

: SA15322

Amoxicillin, Impurities, Nitrosamine

N-Nitroso Amoxicillin EP Impurity D

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CAS No.

: NA

Mol F.

: C16H20N4O7S

Mol W.

: 412.4

Cat No.

: SA15321

Amoxicillin, Impurities, Nitrosamine

N-Nitroso Amoxicillin EP Impurity E

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CAS No.

: NA

Mol F.

: C15H20N4O5S

Mol W.

: 368.4

Cat No.

: SA15303

Aripiprazole, Impurities

N-Nitroso Aripiprazole EP Impurity B

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CAS No.

Mol F.

: C10H11Cl2N3O

Mol W.

: 260.12

Cat No.

: SA24028