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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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Carvedilol, Impurities, Nitrosamine

Nitroso Carvedilol

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CAS No.

Mol F.

: C24H25N3O5

Mol W.

: 435.5

Cat No.

: SA31721

Impurities, Nizatidine

Nizatidine

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CAS No.

: 76963-41-2

Mol F.

: C12H21N5O2S2

Mol W.

: 331.46

Cat No.

: SA34400

Impurities, Nizatidine

Nizatidine EP Impurity A

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CAS No.

: 54252-45-8

Mol F.

: C4H9N3O2

Mol W.

: 131.13

Cat No.

: SA34401

Impurities, Nizatidine

Nizatidine EP Impurity B

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CAS No.

: 61832-41-5

Mol F.

: C4H8N2O2S

Mol W.

: 148.18

Cat No.

: SA34402

Nizatidine

Nizatidine EP Impurity F

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In Stock

CAS No.

: 1193434-62-6

Mol F.

: C15H25N7O4S3

Mol W.

: 463.6

Cat No.

: SA34406

Nizatidine

Nizatidine EP Impurity G

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In Stock

CAS No.

: 1193434-63-7

Mol F.

: C20H33N7O2S4

Mol W.

: 531.78

Cat No.

: SA34407

Impurities, Nizatidine

Nizatidine EP Impurity I

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CAS No.

: 82586-81-0

Mol F.

: C11H20N4CS2

Mol W.

: 288.43

Cat No.

: SA34409

Impurities, Nizatidine

Nizatidine EP Impurity K

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CAS No.

: 112233-23-5

Mol F.

: C5H10ClN3OS

Mol W.

: 195.67

Cat No.

: SA34411

Impurities, Nizatidine

Nizatidine Impurity 4

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CAS No.

Mol F.

: C12H18N4O2S3

Mol W.

: 346.5

Cat No.

: SA34417

Impurities, Nizatidine

Nizatidine N-Oxide

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CAS No.

: NA

Mol F.

: C12H21N5O3S2

Mol W.

: 347.46

Cat No.

: SA34413

Dapoxetine, Impurities

NN-didesmethyl, N-Boc Dapoxetine Impurity

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CAS No.

: 1404234-03-2

Mol F.

: C24H27NO3

Mol W.

: 377.48

Cat No.

: SA23016

Aspirin, Impurities

NO-Aspirin

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CAS No.

: 287118-97-2

Mol F.

: C16H13NO7

Mol W.

: 331.28

Cat No.

: SA28501

19-Norandrostenedione

Norandrostenedione-3-ethyldienol ether

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CAS No.

: 2863-88-9

Mol F.

: C20H28O2

Mol W.

: C20H28O2

Cat No.

: SA15802

Impurities, Norelgestromin

Norelgestromin

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CAS No.

: 53016-31-2

Mol F.

: C21H29NO2

Mol W.

: 327.46

Cat No.

: SA51700

Impurities, Norethindrone

Norethindrone

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CAS No.

: 68-22-4

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13421

Impurities, Norethindrone

Norethindrone 3-Isopropoxy Impurity

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CAS No.

Mol F.

: C23H32O2

Mol W.

: 340.5

Cat No.

: SA13414

Impurities, Norethindrone

Norethindrone 4,5α-Dihydro Impurity

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CAS No.

: 52-79-9

Mol F.

: C20H28O2

Mol W.

: 300.44

Cat No.

: SA13425

Impurities, Norethindrone

Norethindrone Acetate

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CAS No.

: 51-98-9

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13419

Impurities, Norethindrone

Norethindrone Acetate EP Impurity D

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CAS No.

Mol F.

: C24H30O4

Mol W.

: 382.49

Cat No.

: SA13420

Impurities, Norethindrone

Norethindrone EP Impurity D; Δ-5(10)-Norethindrone Acetate

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CAS No.

: 68-23-5

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13423

Impurities, Norethindrone

Norethindrone EP Impurity F; Norethindrone 3-Ethyl Ether

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CAS No.

: 96487-85-3

Mol F.

: C22H30O2

Mol W.

: 326.47

Cat No.

: SA13413

Impurities, Norethindrone

Norethindrone Sulfate Sodium Salt

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CAS No.

: 19778-24-6

Mol F.

: C20H25NaO5S

Mol W.

: 400.46

Cat No.

: SA13428

Impurities, Norethindrone

Norethisterone Acetate Impurity J

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CAS No.

: 734-32-7

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA13418

Impurities, Norethindrone

Norethisterone Enanthate

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CAS No.

: 3836-23-5

Mol F.

: C27H38O3

Mol W.

: 410.59

Cat No.

: SA13436

Impurities, Norgestimate

Norgestimate

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CAS No.

: 35189-28-7

Mol F.

: C23H31NO3

Mol W.

: 369.5

Cat No.

: SA15904

Impurities, Norgestrel

Norgestrel

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CAS No.

: 6533-00-2

Mol F.

: C21H28O2

Mol W.

Cat No.

: SA16801

Impurities, Neostigmine

Norneostigmine; 3-(Dimethylamino)phenyl Dimethylcarbamate

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CAS No.

: 16088-19-0

Mol F.

: C11H16N2O2

Mol W.

: 208.26

Cat No.

: SA19701

Impurities, Tiotropium

Norscopine

$650.00 25 mg

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CAS No.

Mol F.

: C7H11NO2

Mol W.

: 141.17

Cat No.

: SA11720

Impurities, Tiotropium

Norscopolamine

$650.00 25 mg

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CAS No.

: 4684-28-0

Mol F.

: C16H19NO4

Mol W.

: 289.3

Cat No.

: SA11725

Impurities, Naloxone

O- Allyloxymorphone

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CAS No.

: NA

Mol F.

: C20H23NO4

Mol W.

: 341.4

Cat No.

: SA45103

Guanine, Impurities

O-[4-(Aminomethyl)benzyl]guanine

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CAS No.

: 674799-96-3

Mol F.

: C₁₃H₁₄N₆O

Mol W.

: 270.29

Cat No.

: SA32102

Ganciclovir, Impurities

O-Acetyl N-Benzyloxycarbonyl Valganciclovir

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CAS No.

: 194159-22-3

Mol F.

: C₂₄H₃₀N₆O₈

Mol W.

: 530.53

Cat No.

: SA13703

Impurities, Salmeterol

O-Benzyl Salmeterol

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CAS No.

: NA

Mol F.

: C32H43NO4

Mol W.

: 505.69

Cat No.

: SA10117

Dapagliflozin, Impurities

o-Bromo Dapagliflozin Impurity

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CAS No.

Mol F.

: C21H25BrO6

Mol W.

: 453.32

Cat No.

: SA15070

Impurities, Salmeterol

O-Bromophenyl Dibenzyl Salmeterol

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CAS No.

: NA

Mol F.

: C39H48BrNO4

Mol W.

Cat No.

: SA10118

Brexpiprazole, Impurities

O-butyl Bromide Dimer

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CAS No.

: NA

Mol F.

: C26H27BrN2O5

Mol W.

: 511.41

Cat No.

: SA41315

Brexpiprazole, Impurities

O-butyl Bromide Quinolinone

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CAS No.

: NA

Mol F.

: C13H14BrNO2

Mol W.

: 296.16

Cat No.

: SA41311

Brexpiprazole, Impurities

O-butyl Chloride Dimer

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CAS No.

: 2060029-80-1

Mol F.

: C26H27ClN2O4

Mol W.

: 466.95

Cat No.

: SA41314

Brexpiprazole, Impurities

O-butyl Chloride Quinolinone

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CAS No.

: NA

Mol F.

: C13H14ClNO2

Mol W.

: 251.71

Cat No.

: SA41310

Brexpiprazole, Impurities

O-Butyl Iodide Quinolinone

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CAS No.

: 1191901-09-3

Mol F.

: C13H14INO2

Mol W.

: 343.16

Cat No.

: SA41312

Dapagliflozin, Impurities

o-Chloro Dapagliflozin Impurity

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CAS No.

Mol F.

: C21H25ClO6

Mol W.

: 408.87

Cat No.

: SA15069

Febuxostat, Impurities

O-Desisobutyl-O-n-propyl Febuxostat

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CAS No.

: 1530308-87-2

Mol F.

: C15H14N2O3S

Mol W.

: 302.35000000000002

Cat No.

: SA32012

Impurities, Sofosbuvir

O-Desisopropyl O-Desphenyl Sofosbuvir; Sofosbuvir metabolite GS-566500

$595.00 25 mg

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CAS No.

: 1233335-78-8

Mol F.

: C13H19FN3O9P

Mol W.

: 411.28

Cat No.

: SA15440

Brinzolamide, Impurities

O-Desmethyl Brinzolamide Impurity

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CAS No.

: 186377-56-0

Mol F.

: C11H19N3O5S3

Mol W.

: 369.48

Cat No.

: SA47203

Formoterol, Impurities

O-Desmethyl Formoterol Impurity

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CAS No.

: 49861-92-9

Mol F.

: C18H22N2O4

Mol W.

: 330.4

Cat No.

: SA21115

Impurities, Lazertinib

O-Desmethyl Lazertinib

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CAS No.

: NA

Mol F.

: C29H32N8O3

Mol W.

: 540.6

Cat No.

: SA53405

Impurities, Venlafaxine

O-Desmethyl Venlafaxine Dimer

$1,995.00 50 mg

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CAS No.

: 1187545-62-5

Mol F.

: C33H50N2O4

Mol W.

: 538.76

Cat No.

: SA22731

Impurities, Venlafaxine

O-Desmethyl Venlafaxine N-Dimer | CAS : 1187545-61-4

$1,995.00 50 mg

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CAS No.

: 1187545-61-4

Mol F.

: C32H48N2O4

Mol W.

: 524.7

Cat No.

: SA22728

Cefadroxil, Impurities

O-Ethoxycarbonyl Cefadroxil

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CAS No.

: 2378158-44-0

Mol F.

: C19H21N3O7S

Mol W.

: 435.45

Cat No.

: SA42302

Ezetimibe, Impurities

O-Fluoro oxazolidone

$100.00 25 mg

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CAS No.

: 2514695-40-8

Mol F.

: C20H18FNO4

Mol W.

: 355.36

Cat No.

: SA14832