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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, Nitrosamine

N-Nitrosodiethylamine

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CAS No.

: 55-18-5

Mol F.

: C4H10N2O

Mol W.

: 102.13

Cat No.

: SA44643

Impurities, Nitrosamine

N-Nitrosodiisopropylamine

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CAS No.

: 601-77-4

Mol F.

: C6H14N2O

Mol W.

: 130.19

Cat No.

: SA44651

Impurities, Nitrosamine

N-Nitrosodipropylamine

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CAS No.

: 621-64-7

Mol F.

: C6H14N2O

Mol W.

: 130.19

Cat No.

: SA44650

Impurities, Nitrosamine

N-Nitrosofenfluramine

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CAS No.

: 19023-40-6

Mol F.

: C12H15F3N2O

Mol W.

: 260.26

Cat No.

: SA44638

Impurities, Nitrosamine

N-Nitrosomorpholine

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CAS No.

: 59-89-2

Mol F.

: C4H8N2O2

Mol W.

: 116.12

Cat No.

: SA44641

Impurities, Nitrosamine

N-Nitrosonadolol

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CAS No.

: 134720-06-2

Mol F.

: C17H26N2O5

Mol W.

: 338.4

Cat No.

: SA44633

Impurities, Nitrosamine

N-Nitrososarcosine

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CAS No.

: 13256-22-9

Mol F.

: C3H6N2O3

Mol W.

: 118.09

Cat No.

: SA44634

Impurities, Trimetazidine

N-Oxide Trimetazidine Impurity

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CAS No.

Mol F.

: C14H22N2O4

Mol W.

: 282.34

Cat No.

: SA35113

Impurities, Pregabalin

N-Phenyl-rac-pregabalin

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CAS No.

: NA

Mol F.

: C14H21NO2

Mol W.

: 235.32

Cat No.

: SA24817

Impurities, Sitagliptin

N-phosphate Impurity

$395.00 25 mg

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CAS No.

: 1351498-25-3

Mol F.

: C16H16F6N5O4P

Mol W.

: 487.29

Cat No.

: SA10424

Gabapentin, Impurities

N-tert-Butyloxycarbonyl Gabapentin

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CAS No.

: 227626-60-0

Mol F.

: C₁₄H₂₅NO₄

Mol W.

: 271.35000000000002

Cat No.

: SA22809

Brimonidine, Impurities

N-tert-Butyloxycarbonyl Hydroxy Brimonidine

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CAS No.

: 1391053-57-8

Mol F.

: C16H20BrN5O3

Mol W.

: 410.27

Cat No.

: SA20715

Impurities, Losartan

N-Valerylglycine

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CAS No.

: 24003-66-5

Mol F.

: C7H13NO3

Mol W.

: 159.18

Cat No.

: SA26720

Diltiazem, Impurities

N,N-Didesmethyl Diltiazem

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CAS No.

: NA

Mol F.

: C20H22N2O4S

Mol W.

: 386.47

Cat No.

: SA19526

Impurities, Ulipristal

N,N-Didesmethyl Ulipristal

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CAS No.

: 244206-52-8

Mol F.

: C26H31NO3

Mol W.

: 405.53

Cat No.

: SA27904

Impurities, Ulipristal

N,N-Didesmethyl Ulipristal Acetate

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CAS No.

: 244206-49-3

Mol F.

: C28H33NO4

Mol W.

: 447.56

Cat No.

: SA27902

Impurities, Pregabalin

N,N-Diethyl-5-methyl-3-(nitromethyl)hexanamide

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CAS No.

: NA

Mol F.

: C12H24N2O3

Mol W.

: 244.33

Cat No.

: SA24831

Impurities, Metformin

N,N-Dimethyl Guanylmelamine

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CAS No.

: NA

Mol F.

: C6H12N8

Mol W.

: 196.21

Cat No.

: SA27507

Impurities, Tadalafil

N,N-Dimethyl Tadalafil Impurity

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CAS No.

: NA

Mol F.

: C23H21N3O4

Mol W.

: 403.43

Cat No.

: SA20911

Impurities, Zolpidem

N,N-Dimethyl-4-oxo-4-(p-tolyl)butanamid

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CAS No.

: 402470-91-1

Mol F.

: C₁₃H₁₇NO₂

Mol W.

: 219.28

Cat No.

: SA43006

Impurities, Nitrosamine

N,N,N’-trimethyl-N’-nitrosopropane-1,3-diamine

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CAS No.

: NA

Mol F.

: C6H15N3O

Mol W.

: 145.2

Cat No.

: SA44604

Diltiazem, Impurities

N,N,O-Tridesmethyl Diltiazem

$595.00 25 mg

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CAS No.

: 159734-23-3

Mol F.

: C19H20N2O4S

Mol W.

: 372.44

Cat No.

: SA19519

Aciclovir, Impurities

N,N’-[1,2-Ethanediylbis[oxymethylene(1,6-dihydro-6-oxo-9H-purine-9,2-diyl)]]bisacetamide

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CAS No.

: 1417988-85-2

Mol F.

: C18H20N10O6

Mol W.

: 472.41

Cat No.

: SA21410

Impurities, Linezolid

N,O-Desethylene Linezolid

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CAS No.

: 1219708-30-1

Mol F.

: C₁₄H₁₈FN₃O₄

Mol W.

: 311.31

Cat No.

: SA17507

Impurities, Riociguat

N’-(4,6-Diamino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidin-5-yl)-N,N-dimethylformimidamide

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CAS No.

Mol F.

: C20H20FN9

Mol W.

: 405.4

Cat No.

: SA50823

Aciclovir, Impurities

N2-Acetyl Aciclovir Benzoate

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CAS No.

: 133186-23-9

Mol F.

: C17H17N5O5

Mol W.

: 371.35

Cat No.

: SA21423

Impurities, Olmesartan Medoxomil

N2-Trityl O-Methyl Ether Olmesartan Acid

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CAS No.

Mol F.

: C₄₄H₄₂N₆O₃

Mol W.

: 702.84

Cat No.

: SA17749

Impurities, Olmesartan Medoxomil

N2-Trityl O-Methyl Ether Olmesartan Acid Ethyl Ester

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CAS No.

Mol F.

: C₄₆H₄₆N₆O₃

Mol W.

: 730.89

Cat No.

: SA17750

Impurities, Olmesartan Medoxomil

N2-Trityl Olmesartan Ethyl Ester

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CAS No.

: 172875-59-1

Mol F.

: C₄₅H₄₄N₆O₃

Mol W.

: 716.87

Cat No.

: SA17746

Impurities, Olmesartan Medoxomil

N2-Trityl Olmesartan Lactone

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CAS No.

: 1048948-15-7

Mol F.

: C₄₃H₃₈N₆O₂

Mol W.

: 670.8

Cat No.

: SA17722

Impurities, Olmesartan Medoxomil

N2-Trityl Olmesartan Medoxomil Methyl Ether

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CAS No.

Mol F.

: C₄₉H₄₆N₆O₆

Mol W.

: 814.92

Cat No.

: SA17747

Impurities, Olmesartan Medoxomil

N2-Trityl Olmesartan Methyl Ketone

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CAS No.

Mol F.

: C₄₄H₄₂N₆O₂

Mol W.

: 686.84

Cat No.

: SA17748

Impurities, Valsartan

N2-Trityl Valsartan Benzyl Ester

$995.00 500 mg

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CAS No.

Mol F.

: C50H49N5O3

Mol W.

: 767.95

Cat No.

: SA33315

Impurities, Valsartan

N2-Trityl Valsartan Methyl Ester

$995.00 500 mg

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CAS No.

: 883223-10-7

Mol F.

: C44H45N5O3

Mol W.

: 691.86

Cat No.

: SA33312

Impurities, Valsartan

N2-Trityl Valsartan R-Isomer

$1,495.00 500 mg

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CAS No.

Mol F.

: C43H43N5O3

Mol W.

: 677.83

Cat No.

: SA33316

Gemcitabine, Impurities

N4-Acetylcytosine

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CAS No.

: 14631-20-0

Mol F.

: C6H7N3O2

Mol W.

: 153.13999999999999

Cat No.

: SA44506

Hydrochlorothiazide, Impurities

N4-Hydroxymethyl Hydrochlorothiazide

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CAS No.

: 1216599-78-8

Mol F.

: C₈H₁₀ClN₃O₅S₂

Mol W.

: 327.77

Cat No.

: SA11206

Impurities, Palbociclib

N5-(2-aminoethyl)pyridine-2,5-diamine

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CAS No.

: 1248105-96-5

Mol F.

: C7H12N4

Mol W.

: 152.2

Cat No.

: SA40419

Impurities, Naloxone

Naloxone HCl – API

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CAS No.

: 357-08-4; 465-65-6(Free Base)

Mol F.

: C19H21NO4

Mol W.

: 327.37

Cat No.

: SA45100

Impurities, Nandrolone

Nandrolone phenylpropionate

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CAS No.

: 62-90-8

Mol F.

: C27H34O3

Mol W.

: C27H34O3

Cat No.

: SA16306

Impurities, Naproxen

Naproxen EP Impurity J

$125.00 25 mg

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CAS No.

: 21388-17-0

Mol F.

: C13H14O

Mol W.

: 186.25

Cat No.

: SA20415

Impurities, Naproxen

Naproxen EP Impurity O

$125.00 25 mg

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CAS No.

: 156967-24-7

Mol F.

: C17H20O3

Mol W.

: 272.34

Cat No.

: SA20414

Impurities, Naratriptan

Naratriptan 2-Carboxylic Acid

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CAS No.

: 874583-40-1

Mol F.

: C₁₈H₂₅N₃O₄S

Mol W.

: 379.47

Cat No.

: SA30806

Impurities, Naratriptan

Naratriptan Hydrochloride

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CAS No.

: 121679-13-8 (Base free); 143388-64-1 (HCl salt)

Mol F.

: C17H26ClN3O2S

Mol W.

: 371.93

Cat No.

: SA30800

Impurities, Naratriptan

Naratriptan Impurity C

$1,550.00 25 mg

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CAS No.

: 1346604-16-7

Mol F.

: C31H41N5O2S

Mol W.

: 547.75

Cat No.

: SA30803

Impurities, Naratriptan

Naratriptan Impurity E

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CAS No.

: 1346600-26-7

Mol F.

: C20H33ClN4O4S2

Mol W.

: 493.08

Cat No.

: SA30804

Impurities, Naratriptan

Naratriptan Impurity F

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CAS No.

: 2144776-33-8

Mol F.

: C20H27ClN4O4S2

Mol W.

: 487.04

Cat No.

: SA30805

Impurities, Naratriptan

Naratriptan N-Methiodide

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CAS No.

: NA

Mol F.

: C18H28IN3O2S

Mol W.

: 477.4

Cat No.

: SA30808

Impurities, Naratriptan

Naratriptan Pyridinium Iodide

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CAS No.

: 1638617-36-3 (Free base)

Mol F.

: C17H20IN3O2S

Mol W.

: 457.33

Cat No.

: SA30812

Impurities, Naratriptan

Naratriptan pyridinium salt

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CAS No.

: NA

Mol F.

: C17H20ClN3O2S

Mol W.

: 365.88

Cat No.

: SA30809