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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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Efavirenz, Impurities

2-Deoxo 2-(4-methoxyphenyl) Efavirenz

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CAS No.

: 209414-26-6

Mol F.

: C₂₁H₁₇ClF₃NO₂

Mol W.

: 407.81

Cat No.

: SA17612

Efavirenz, Impurities

2-Deoxo-3-desoxy Efavirenz

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CAS No.

Mol F.

: C₁₅H₁₃ClF₃N

Mol W.

: 299.72

Cat No.

: SA17618

Gemcitabine, Impurities

2-Deoxy-2,2-difluoro-D-erythro-pentofuranos-1-ulose-3,5-dibenzoate

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CAS No.

: 122111-01-7

Mol F.

: C19H14F2O6

Mol W.

: 376.31

Cat No.

: SA44507

Decitabine, Impurities

2-Deoxy-D-erythro-pentopyranosyl Chloride Bis(4-methylbenzoate) (Mixture of ±/β isomers)

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CAS No.

: 20535-28-8

Mol F.

: C21H21ClO5

Mol W.

: 388.84

Cat No.

: SA42213

Apremilast, Impurities

2-Desacetyl Apremilast Open Chain Analog

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CAS No.

Mol F.

: C20H24N2O7S

Mol W.

: 436.48

Cat No.

: SA30023

Dorzolamide, Impurities

2-Desaminosulfonyl 3-Aminosulfonyl Dorzolamide

$1,455.00 25 mg

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CAS No.

: 199734-71-9

Mol F.

: C10H16N2O4S3

Mol W.

: 324.44

Cat No.

: SA24110

Flurbiprofen, Impurities

2-desfluoro-2 amino Flurbiprofen

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CAS No.

: 52806-72-1

Mol F.

: C15H15NO2

Mol W.

: 241.29

Cat No.

: SA14616

Impurities, Neostigmine

2-dimethyl amino phenol

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CAS No.

: 3743-22-4

Mol F.

: C8H11NO

Mol W.

: 137.18

Cat No.

: SA19705

Impurities, Remdesivir

2-Ethylbutyl ((4-nitrophenoxy)(phenoxy)phosphoryl)-D-alaninate

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CAS No.

Mol F.

: C21H27N2O7P

Mol W.

: 450.4

Cat No.

: SA42728

Impurities, Remdesivir

2-Ethylbutyl ((S)-(perfluorophenoxy)(phenoxy)phosphoryl)-L-alaninate

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CAS No.

: 1911578-98-7

Mol F.

: C21H23F5NO5P

Mol W.

: 495.4

Cat No.

: SA42730

Impurities, Remdesivir

2-Ethylbutyl (2S)-2-aminopropionate

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CAS No.

: 946565-74-8

Mol F.

: C9H19NO2

Mol W.

: 173.3

Cat No.

: SA42712

Building Blocks, Impurities

2-Fluoro-5-formylbenzamide

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CAS No.

: 1236289-88-5

Mol F.

: C8H6FNO2

Mol W.

: 167.14

Cat No.

: SB10707

Impurities, Meclofenamic Acid

2-Fluorobenzoic Acid

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CAS No.

: 445-29-4

Mol F.

: C₇H₅FO₂

Mol W.

: 140.11

Cat No.

: SA10604

Atorvastatin, Impurities

2-fluro diketoatorvastatin derivative

$500.00 250 mg

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CAS No.

: 1797905-42-0

Mol F.

: C26H24FNO3

Mol W.

: 417.47

Cat No.

: SA17803

Impurities, Mometasone

2-Furoic acid

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CAS No.

: 88-14-2

Mol F.

: C5H4O3

Mol W.

: 112

Cat No.

: SA28725

Deferasirox, Impurities

2-HYDRAZINO BENZOIC ACID

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CAS No.

: 5326-27-2

Mol F.

: C7H8N2O2

Mol W.

: 152.151

Cat No.

: SA25114

Carbamazepine, Impurities

2-Hydroxy Carbamazepine

$495.00 25 mg

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CAS No.

: 68011-66-5

Mol F.

: C15H12N2O2

Mol W.

: 252.27

Cat No.

: SA20321

Cephalexin, Impurities

2-Hydroxy Cephalexin

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CAS No.

: 215172-75-1

Mol F.

: C16H17N3O5S

Mol W.

: 363.39

Cat No.

: SA12017

Doxepin, Impurities

2-Hydroxy Doxepin

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CAS No.

: 131523-90-5

Mol F.

: C19H21NO2

Mol W.

: 295.37

Cat No.

: SA29909

Ethinylestradiol, Impurities

2-Hydroxy Ethinylestradiol

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CAS No.

: 50394-89-3

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA13109

Impurities, Tiotropium

2-Hydroxy-2-(thiophen-2-yl)-2-(thiophen-3-yl)acetic Acid Methyl Ester

$345.00 25 mg

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CAS No.

: 28748-67-6

Mol F.

: C11H10O3S2

Mol W.

: 254.33

Cat No.

: SA11717

Impurities, Tolterodine

2-Hydroxy-5-methyl-γ-phenylbenzenepropanol

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CAS No.

: 851789-43-0

Mol F.

: C16H18O2

Mol W.

: 242.31

Cat No.

: SA28213

Decitabine, Impurities

2-Hydroxymethyl-5-methoxy-tetrahydro-furan-3-ol

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CAS No.

: NA

Mol F.

: C6H12O4

Mol W.

: 148.16

Cat No.

: SA42215

Ethisterone, Impurities

2-Hydroxymethylene Ethisterone

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CAS No.

: 2787-02-2

Mol F.

: C₂₂H₂₈O₃

Mol W.

: 340.46

Cat No.

: SA12904

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

Building Blocks, Impurities

2-Pyridinecarboxaldehyde | CAS : 1121-60-4

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CAS No.

: 1121-60-4

Mol F.

: C6H5NO

Mol W.

: 107.11

Cat No.

: SB10710

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