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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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Dutasteride, Impurities

2-Iodo 17-carboxylic acid Dutasteride

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CAS No.

: NA

Mol F.

: C20H30INO3

Mol W.

: 459.36

Cat No.

: SA35214

Impurities, Zolpidem

2-Keto Zolpidem

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CAS No.

: 400038-68-8

Mol F.

: C19H19N3O2

Mol W.

: 321.37

Cat No.

: SA43002

Ethinylestradiol, Impurities

2-Methoxy-17α-Ethinylestradiol

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CAS No.

: 22415-44-7

Mol F.

: C21H26O3

Mol W.

: 326.43

Cat No.

: SA13127

Impurities, Ranolazine

2-Methoxyphenol

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CAS No.

: 90-05-1

Mol F.

: C7H8O2

Mol W.

: 124.14

Cat No.

: SA26811

Carbamazepine, Impurities

2-Methyl Carbamazepine

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CAS No.

: 70401-32-0

Mol F.

: C16H14N2O

Mol W.

: 250.3

Cat No.

: SA20327

Impurities, Pazopanib

2-Methyl-5-nitrobenzenesulfonamide

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CAS No.

: 6269-91-6

Mol F.

: C7H8N2O4S

Mol W.

: 216.21

Cat No.

: SA51317

Carbamazepine, Impurities

2-Methyl-5H-dibenzazepine

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CAS No.

: 70401-31-9

Mol F.

: C15H13N

Mol W.

: 207.27

Cat No.

: SA20344

Estrone, Impurities

2-Methylestrone

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CAS No.

: 2626-12-2

Mol F.

: C19H24O2

Mol W.

: 284.39

Cat No.

: SA16007

Amiodarone, Impurities

2-n-Butyl-4-[(2-bromoethoxy)-3,5-diiodobenzoyl]benzofuran

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CAS No.

: 96027-84-8

Mol F.

: C21H19BrI2O3

Mol W.

: 653.09

Cat No.

: SA26413

Impurities, Rilpivirine

2-Nitro-1,3-benzenedimethanol

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CAS No.

: 16578-60-2

Mol F.

: C8H9NO4

Mol W.

: 183.16

Cat No.

: SA25413

Impurities, Rilpivirine

2-Nitroisophthalic Acid

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CAS No.

: 21161-11-5

Mol F.

: C8H5NO6

Mol W.

: 211.13

Cat No.

: SA25412

Fingolimod, Impurities

2-Phenethyl Fingolimod Impurity

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CAS No.

: 851039-25-3

Mol F.

: C35H57NO2

Mol W.

: 523.83000000000004

Cat No.

: SA34502

Impurities, Naratriptan

2‐[3‐(1‐Methylpiperidin‐4‐yl)‐1H‐indol‐5‐yl]ethane‐sulfonic acid

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CAS No.

: 2512213-55-5

Mol F.

: C20H32N4O4S2

Mol W.

: 456.63

Cat No.

: SA30810

Impurities, Tulobuterol

2,2-dibromo-1-(2-chlorophenyl)ethan-1-ol

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CAS No.

: 179749-59-8

Mol F.

: C8H7Br2ClO

Mol W.

: 314.39999999999998

Cat No.

: SA19605

Impurities, Tulobuterol

2,2-dibromo-1-(2-chlorophenyl)ethan-1-one

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CAS No.

: 34356-83-7

Mol F.

: C8H5Br2ClO

Mol W.

: 312.38

Cat No.

: SA19604

Gemcitabine, Impurities

2,2-Difluoro-3,4,5-trihydroxypentanoic acid

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CAS No.

: 1824520-32-2

Mol F.

: C5H8F2O5

Mol W.

: 186.1

Cat No.

: SA44509

Gemcitabine, Impurities

2,2-Dimethyl-1,3-dioxolane-4-carboxaldehyde

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CAS No.

: NA

Mol F.

: C6H10O3

Mol W.

: 130.13999999999999

Cat No.

: SA44502

Impurities, Ranolazine

2,2′-(4,4′-(2-hydroxypropane-1,3-diyl)bis(piperazine-4,1-diyl))bis(N-(2,6-dimethylphenyl)acetamide)

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CAS No.

: 1213269-66-9

Mol F.

: C31H46N6O3

Mol W.

: 550.73

Cat No.

: SA26815

Colesevelam, Impurities

2,2′-azobis(2-amidinopropane) dihydrochloride

$70.00 25 mg

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CAS No.

: 2997-92-4

Mol F.

: C8H20Cl2N6

Mol W.

: 271.19

Cat No.

: SA10208

Impurities, Rosuvastatin

2,3-Anhydro Rosuvastatin Calcium Salt

$755.00 50 mg

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CAS No.

Mol F.

: C22H27FN3O5S.1/2Ca

Mol W.

: 484.5

Cat No.

: SA12132

Impurities, Rosuvastatin

2,3-Anhydro Rosuvastatin Methyl Ester

$350.00 25 mg

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CAS No.

: 2452383-22-9

Mol F.

: C23H28FN3O5S

Mol W.

: 477.55

Cat No.

: SA12128

Eslicarbazepine, Impurities

2,3-Bis(acetyloxy)butanedioic Acid Impurity

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CAS No.

: 475674-43-2

Mol F.

: 475674-43-2

Mol W.

: 470.43

Cat No.

: SA28803

Impurities, Topiramate

2,3-Desisopropylidene Topiramate Impurity

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CAS No.

: 851957-35-2

Mol F.

: C9H17NO8S

Mol W.

: 299.3

Cat No.

: SA45507

Impurities, Zopiclone

2,3-Dicarboxypyrazine;

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CAS No.

: 89-01-0

Mol F.

: C6H4N2O4

Mol W.

: 168.11

Cat No.

: SA38706

Fluorometholone, Impurities

2,3-Dichloropropan-1-ol

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CAS No.

: 616-23-9

Mol F.

: C3H6Cl2O

Mol W.

: 128.99

Cat No.

: SA38416

Impurities, Zopiclone

2,3-Pyrazinedicarboxylic Acid Anhydride

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CAS No.

: 4744-50-7

Mol F.

: C6H2N2O3

Mol W.

: 150.09

Cat No.

: SA38704

Impurities, Rosuvastatin

2,3,4,5-Dianhydro Rosuvastatin Methyl Ester

$1,995.00 50 mg

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CAS No.

Mol F.

: C23H26FN3O4S

Mol W.

: 459.53

Cat No.

: SA12140

Dapagliflozin, Impurities

2,3,4,6-Tetrakis-O-trimethylsilyl-D-gluconolactone

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CAS No.

: 32384-65-9

Mol F.

: C18H42O6Si4

Mol W.

: 466.88

Cat No.

: SA15018

Impurities, Remdesivir

2,3,5-Tri-O-benzyl-D-ribono-1,4-lactone

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CAS No.

: 55094-52-5

Mol F.

: C26H26O5

Mol W.

: 418.5

Cat No.

: SA42727

Impurities, Remdesivir

2,3,5-Tri-O-benzyl-D-ribose

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CAS No.

: 54623-25-5

Mol F.

: C26H28O5

Mol W.

: 420.5

Cat No.

: SA42732

Building Blocks, Impurities

2,4-di-tert-butyl-5-methylphenol

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CAS No.

: 497-39-2

Mol F.

: C15H24O

Mol W.

: 220.35

Cat No.

: SB10728

Dapsone, Impurities

2,4-Diaminophenyl Sulfone

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CAS No.

: 116435-84-8

Mol F.

: C12H12N2O2S

Mol W.

: 248.3

Cat No.

: SA27016

Aciclovir, Impurities

2,4-Dichloro-1-nitrobenzene

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CAS No.

: 611-06-3

Mol F.

: C6H3Cl2NO2

Mol W.

: 192

Cat No.

: SA21403

Impurities, Pregabalin

2,4-Dicyano-3-(2-methylpropyl)-pentanediamide

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CAS No.

: 185815-56-9

Mol F.

: C11H16N4O2

Mol W.

: 236.27

Cat No.

: SA24830

Impurities, Pregabalin

2,4-Dicyano-3-isobutyl-glutaric Acid

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CAS No.

: 99068-93-6

Mol F.

: C10H12N2O4

Mol W.

: 224.21

Cat No.

: SA24829

Impurities, Rosuvastatin

2,4-Dideoxy-6-O-(phenylmethyl)-L-threo-hexonic Acid tert-Butyl Ester

$1,050.00 25 mg

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CAS No.

: 215876-09-8

Mol F.

: C17H26O5

Mol W.

: 310.39

Cat No.

: SA12160

Impurities, Neostigmine

2,4-Pyridinediamine

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CAS No.

: 461-88-1

Mol F.

: C5H7N3

Mol W.

: 109.13

Cat No.

: SA19709

Empagliflozin, Impurities

2,5-Anhydro-d-gluconic acid

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CAS No.

: 490-94-8

Mol F.

: C6H10O6

Mol W.

: 178.14

Cat No.

: SA15142

Impurities, Ribociclib

2,5-Dibromo-N-cyclopentylpyrimidin-4-amine

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CAS No.

: 2481084-18-6

Mol F.

: C9H11Br2N3

Mol W.

: 321

Cat No.

: SA47112

Impurities, Ribociclib

2,5-Dichloro-N-cyclopentylpyrimidin-4-amine

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CAS No.

: 1214279-37-4

Mol F.

: C9H11Cl2N3

Mol W.

: 232.1

Cat No.

: SA47111

Building Blocks, Impurities

2,6-di-tert-butylphenol

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CAS No.

: 128-39-2

Mol F.

: C14H22O

Mol W.

: 206.32

Cat No.

: SB10729

Impurities, Nitrosamine, Sapropterin

2,6-Diamino-4-hydroxy-5-nitrosopyrimidine

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CAS No.

: 2387-48-6

Mol F.

: C4H5N5O2

Mol W.

: 155.12

Cat No.

: SA45215

Impurities, Meclofenamic Acid

2,6-Dichloro-3-methylaniline

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CAS No.

: 64063-37-2

Mol F.

: C₇H₇Cl₂N

Mol W.

: 176.04

Cat No.

: SA10603

Impurities, Rilpivirine

2,6-Dihydroxymethyl Rilpivirine

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CAS No.

: NA

Mol F.

: C22H18N6O2

Mol W.

: 398.42

Cat No.

: SA25402

Brexpiprazole, Impurities

2,7-Bis(4-bromobutoxy)quinoline

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CAS No.

: NA

Mol F.

: C17H21B2NO2

Mol W.

: 431.16

Cat No.

: SA41340

Brexpiprazole, Impurities

2,7-Bis(4-chlorobutoxy)quinoline

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CAS No.

: 2060027-95-2

Mol F.

: C17H21Cl2NO2

Mol W.

: 342.3

Cat No.

: SA41334

Impurities, Molnupiravir

2′,3′-Isopropylideneuridine

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CAS No.

: 362-43-6

Mol F.

: C12H16N2O6

Mol W.

: 284.27

Cat No.

: SA46205

Impurities, Sofosbuvir

2’S-β-Fluoro tribenzoyl sofosbuvir intermidiate

$1,595.00 25 mg

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CAS No.

: 817204-32-3

Mol F.

: C31H26FN3O7

Mol W.

: 571.55

Cat No.

: SA15438

Impurities, Sofosbuvir

2′-Keto Sofosbuvir

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CAS No.

Mol F.

: C21H26N3O10P

Mol W.

: 511.42

Cat No.

: SA15410

Impurities, Prednisone

20-Hydroxymethyl Prednisone (Mixture of Diastereomers)

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CAS No.

: 1620672-12-9

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA26211