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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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Ethinylestradiol, Impurities

3-(Acetyloxy)-1-methylestra-1,3,5(10),6-tetraen-17-one

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CAS No.

: 53-55-4

Mol F.

: C21H24O3

Mol W.

: 324.41

Cat No.

: SA13130

Impurities, Pregabalin

3-(Aminomethyl)-5-methyl-hexanoic Acid Phenylmethyl Ester Hydrochloride

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CAS No.

: 649748-11-8(HCl);1480521-53-6(Base)

Mol F.

: C15H2NO2.HCl

Mol W.

: 285.81

Cat No.

: SA24823

Impurities, Pregabalin

3-(Bis((S)-4-isobutyl-2-oxopyrrolidin-1-yl)methyl)-5-methylhexanoic Acid

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CAS No.

: NA

Mol F.

: C24H42N2O4

Mol W.

: 422.6

Cat No.

: SA24809

Impurities, Pitavastatin

3-(Bromomethyl)-2-cyclopropyl-4-(4-fluorophenyl)quinoline

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CAS No.

: 154057-56-4

Mol F.

: C19H15BrFN

Mol W.

: 356.23

Cat No.

: SA29523

Impurities, Neostigmine

3-(tert-Butyldimethylsilyloxy)aniline

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CAS No.

: 121942-75-4

Mol F.

: C12H21NOSi

Mol W.

: 223.39

Cat No.

: SA19708

Impurities, Sitagliptin

3-(Trifluoromethyl)-6,7-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-8(5H)-one

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CAS No.

: 877402-45-4

Mol F.

: C6H5F3N4O

Mol W.

: 206.13

Cat No.

: SA10439

Impurities, Tofacitinib

3-[(3R,4R)-4-methyl-3-[methyl({7H-pyrrolo[2,3-d]pyrimidin-4-yl})amino]piperidin-1-yl]3-oxopropanenitrile-N-Oxide

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CAS No.

: NA

Mol F.

: C16H20N6O2

Mol W.

: 328.38

Cat No.

: SA43309

Impurities, Pregabalin

3-[[[(1,1-Dimethylethoxy)carbonyl]amino]methyl]-5-methyl-hexanoic Acid Phenylmethyl Ester

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CAS No.

: 1990538-01-6

Mol F.

: C20H31NO4

Mol W.

: 349.46

Cat No.

: SA24835

Impurities, Pregabalin

3-[[[(1,1-Dimethylethoxy)carbonyl]amino]methyl]-5-methylhexanoic Acid

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CAS No.

: 228104-41-4

Mol F.

: C13H25NO4

Mol W.

: 259.33999999999997

Cat No.

: SA24834

Impurities, Pregabalin

3-[[[3-(Aminomethyl)-5-methyl-1-oxohexyl]amino]methyl]-5-methyl-hexanoic Acid

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CAS No.

: 1486961-58-3

Mol F.

: C16H32N2O3

Mol W.

: 300.83999999999997

Cat No.

: SA24824

Impurities, Pregabalin

3-[[[3-[[[(1,1-Dimethylethoxy)carbonyl]amino]methyl]-5-methyl-1-oxohexyl]amino]methyl]-5-methyl-hexanoic Acid Phenylmethyl

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CAS No.

: 1990538-02-7

Mol F.

: C28H46N2O5

Mol W.

: 490.68

Cat No.

: SA24833

Empagliflozin, Impurities

3-{4-[2-chloro-5-(tetrahydrofuran-3-yloxy)benzyl]phenoxy}tetrahydrofuran

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CAS No.

Mol F.

: C21H23ClO4

Mol W.

: 374.86

Cat No.

: SA15149

Decitabine, Impurities

3-acetoxy-5-methoxy-tetrahydrofuran-2-yl methyl ester Acetic acid

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CAS No.

: NA

Mol F.

: C10H16O6

Mol W.

: 232.23

Cat No.

: SA42214

Aspirin, Impurities

3-Acetoxybenzoic Acid

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CAS No.

: 6304-89-8

Mol F.

: C9H8O4

Mol W.

: 180.16

Cat No.

: SA28503

Impurities, Linagliptin

3-Aminopiperidine

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CAS No.

: 54012-73-6

Mol F.

: C5H12N2

Mol W.

: 100.16

Cat No.

: SA49917

Dolutegravir, Impurities

3-Benzyloxy-2-(2-hydroxy-2-phenylethyl)-4H-pyran-4-one

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CAS No.

: 1206102-04-6

Mol F.

: C20H18O4

Mol W.

: 322.35

Cat No.

: SA20214

Impurities, Zolpidem

3-Bromo Zolpidem

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CAS No.

Mol F.

: C19H20BrN3O

Mol W.

: 386.31

Cat No.

: SA43010

Dolutegravir, Impurities

3-Bromo-1-(2,2-dimethoxyethyl)-1,4-dihydro-4-oxo-2,5-pyridinedicarboxylic Acid 2,5-Diethyl Ester

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CAS No.

: 1246616-76-1

Mol F.

: C15H20BrNO7

Mol W.

: 406.23

Cat No.

: SA20216

Apixaban, Impurities

3-Carbamoyl-1-(4-methoxyphenyl)-4-(2-((4-(2-oxopiperidin-1-yl)phenyl)amino)ethyl)-1H-pyrazole-5-carboxylic acid, potassium salt

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CAS No.

: 2206825-81-0 (Free salt)

Mol F.

: C25H26KN5O5

Mol W.

: 515.6

Cat No.

: SA39947

Glyburide, Impurities

3-Chloro Glyburide

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CAS No.

: 57334-89-1

Mol F.

: C23H28Cl2N3O5S

Mol W.

: 528.45

Cat No.

: SA12302

Impurities, Prochlorperazine Maleate

3-chloro-1-(10H-phenothiazin-10-yl)propan-1-one | CAS: 4091-91-2

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CAS No.

: 4091-91-2

Mol F.

: C15H12ClNOS

Mol W.

: 289.8

Cat No.

: SA45605

Impurities, Nitrosamine

3-Chloro-N-methyl-N-nitrosopropan-1-amine

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CAS No.

: NA

Mol F.

: C4H9ClN2O

Mol W.

: 136.58

Cat No.

: SA44605

Bupropion, Impurities

3-Chlorobenzoic acid

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CAS No.

: 535-80-8

Mol F.

: C7H5ClO2

Mol W.

: 156.57

Cat No.

: SA12230

Chlorpromazine, Impurities

3-Chlorodiphenylamine

$95.00 25 mg

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CAS No.

: 101-17-7

Mol F.

: C12H10ClN

Mol W.

: 203.67

Cat No.

: SA21601

Impurities, Trazodone

3-chlorophenylpiperazine

$155.00 100 mg

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CAS No.

: 65369-76-8

Mol F.

: C10H14Cl2N2

Mol W.

: 233.13

Cat No.

: SA30311

Clotrimazole, Impurities

3-Chlorotrityl chloride

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CAS No.

: 59154-29-9

Mol F.

: C19H14Cl2

Mol W.

: 313.22

Cat No.

: SA11606

Impurities, Raloxifene

3-Des[4-(2-Piperidinyl)ethoxy]benzoyl-7-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene

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CAS No.

: 1391054-73-1

Mol F.

: C28H27NO4S

Mol W.

: 473.58

Cat No.

: SA24911

Impurities, Trimethoprim

3-Desmethyl Trimethoprim

$395.00 25 mg

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CAS No.

: 27653-69-6

Mol F.

: C13H16N4O3

Mol W.

: 276.29

Cat No.

: SA27113

Impurities, Neostigmine

3-Dimethylaminophenol

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CAS No.

: 99-07-0

Mol F.

: C8H11NO

Mol W.

: 137.18

Cat No.

: SA19714

Empagliflozin, Impurities

3-Epi Empagliflozin Enantiomer (S-Isomer) Tetraacetate

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CAS No.

: NA

Mol F.

: C31H35ClO11

Mol W.

: 619.06

Cat No.

: SA15162

Impurities, Niacin

3-Ethylpyridine

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CAS No.

: 536-78-7

Mol F.

: C7H9N

Mol W.

: 107.15

Cat No.

: SA33109

Erlotinib, Impurities

3-Ethynylbenzenamine hydrochloride

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CAS No.

: 207226-02-6

Mol F.

: C8H8ClN

Mol W.

: 153.6

Cat No.

: SA25216

Deferasirox, Impurities

3-HYDRAZINO BENZOIC ACID

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CAS No.

: 38235-71-1

Mol F.

: C7H8N2O2

Mol W.

: 152.151

Cat No.

: SA25115

Carbamazepine, Impurities

3-Hydroxy Carbamazepine

$495.00 25 mg

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CAS No.

: 68011-67-6

Mol F.

: C15H12N2O2

Mol W.

: 252.27

Cat No.

: SA20323

Carbamazepine, Impurities

3-Hydroxy Carbamazepine tert-Butyldimethylsilyl Ether

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CAS No.

: NA

Mol F.

: C21H26N2O2Si

Mol W.

: 366.53

Cat No.

: SA20325

Donepezil, Impurities

3-Hydroxy Donepezil Impurity

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CAS No.

: 2097683-67-3(Base)

Mol F.

: C24H30ClNO4

Mol W.

: 431.95

Cat No.

: SA34307

Equilin, Impurities

3-Hydroxy-6,7-dibromo 17β-Acetoxyestra-1,3,5(10)-triene

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CAS No.

Mol F.

: C₂₀H₂₄Br₂O₃

Mol W.

: 472.21

Cat No.

: SA16406

Impurities, Meclofenamic Acid

3-Hydroxymethyl Meclofenamic Acid

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CAS No.

: 67318-61-0

Mol F.

: C₁₄H₁₁Cl₂NO₃

Mol W.

: 312.15

Cat No.

: SA10602

Impurities, Neostigmine

3-Hydroxyphenyltrimethylammonium Methylsulfate

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CAS No.

: NA

Mol F.

: C10H17NO4S

Mol W.

: 247.31

Cat No.

: SA19715

Impurities, Pregabalin

3-Isobutylglutaric Anhydride

$95.00 25 mg

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CAS No.

: 185815-59-2

Mol F.

: C9H14O3

Mol W.

: 170.21

Cat No.

: SA24836

Carbamazepine, Impurities

3-Methoxy-5H-dibenz[b,f]azepine

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CAS No.

: 92483-74-4

Mol F.

: C15H13NO

Mol W.

: 223.27

Cat No.

: SA20331

Impurities, Neostigmine

3-methoxy-N,N,N-trimethylbenzenaminium methyl sulfate

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CAS No.

: 39218-17-2

Mol F.

: C11H19NO5S

Mol W.

: 277.34

Cat No.

: SA19711

Argatroban, Impurities

3-Methyl-1,2,3,4-tetrahydroquinoline-8-sulfonic acid

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CAS No.

: 153886-68-1

Mol F.

: C10H13NO3S

Mol W.

: 227.3

Cat No.

: SA48411

Impurities, Pazopanib

3-Methyl-6-nitro-2H-indazole

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CAS No.

: 1313372-75-6

Mol F.

: C8H7N3O2

Mol W.

: 177.16

Cat No.

: SA51312

Impurities, Leflunomide

3-Methylisoxazole-4-carboxylic Acid

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CAS No.

: 17153-20-7

Mol F.

: C5H5NO3

Mol W.

: 127.1

Cat No.

: SA21816

Impurities, Leflunomide

3-Methylisoxazole-4-carboxylic Acid Ethyl Ester

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CAS No.

: 20328-15-8

Mol F.

: C7H9NO3

Mol W.

: 155.15

Cat No.

: SA21817

Apixaban, Impurities

3-Morpholino-1-(2-nitrophenyl)-5,6-dihydropyridin-2(1H)-one

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CAS No.

Mol F.

: C15H17N3O4

Mol W.

: 303.3

Cat No.

: SA39960

Apixaban, Impurities

3-Morpholino-1-(3-nitrophenyl)-5,6-dihydropyridin-2(1H)-one

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CAS No.

: 2443747-50-8

Mol F.

: C15H17N3O4

Mol W.

: 303.3

Cat No.

: SA39959

Apixaban, Impurities

3-Morpholino-1-(4-(2-oxo-3,4-dihydropyridin-1(2H)-yl)phenyl)-5,6-dihydropyridin-2(1H)-one

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CAS No.

Mol F.

: C20H23N3O3

Mol W.

: 353.41

Cat No.

: SA39945

Apremilast, Impurities

3-Nitrophthalic Anhydride

$78.00 25 mg

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CAS No.

: 641-70-3

Mol F.

: C₈H₃NO₅

Mol W.

: 193.11

Cat No.

: SA30015

Impurities

Ethinylestradiol, Impurities

3-(Acetyloxy)-1-methylestra-1,3,5(10),6-tetraen-17-one

CAS No.

: 53-55-4

Mol F.

: C21H24O3

Mol W.

: 324.41

Cat No.

: SA13130

Impurities, Pregabalin

3-​(Aminomethyl)​-​5-​methyl-hexanoic Acid Phenylmethyl Ester Hydrochloride

CAS No.

: 649748-11-8(HCl);1480521-53-6(Base)

Mol F.

: C15H2NO2.HCl

Mol W.

: 285.81

Cat No.

: SA24823

Impurities, Pregabalin

3-(Bis((S)-4-isobutyl-2-oxopyrrolidin-1-yl)methyl)-5-methylhexanoic Acid

CAS No.

: NA

Mol F.

: C24H42N2O4

Mol W.

: 422.6

Cat No.

: SA24809

Impurities, Pitavastatin

3-(Bromomethyl)-2-cyclopropyl-4-(4-fluorophenyl)quinoline

CAS No.

: 154057-56-4

Mol F.

: C19H15BrFN

Mol W.

: 356.23

Cat No.

: SA29523

Impurities, Neostigmine

3-(tert-Butyldimethylsilyloxy)aniline

CAS No.

: 121942-75-4

Mol F.

: C12H21NOSi

Mol W.

: 223.39

Cat No.

: SA19708

Impurities, Sitagliptin

3-(Trifluoromethyl)-6,7-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-8(5H)-one

CAS No.

: 877402-45-4

Mol F.

: C6H5F3N4O

Mol W.

: 206.13

Cat No.

: SA10439

Impurities, Tofacitinib

3-[(3R,4R)-4-methyl-3-[methyl({7H-pyrrolo[2,3-d]pyrimidin-4-yl})amino]piperidin-1-yl]3-oxopropanenitrile-N-Oxide

CAS No.

: NA

Mol F.

: C16H20N6O2

Mol W.

: 328.38

Cat No.

: SA43309

Impurities, Pregabalin

3-​[[[(1,​1-​Dimethylethoxy)​carbonyl]​amino]​methyl]​-​5-​methyl-​hexanoic Acid Phenylmethyl Ester

CAS No.

: 1990538-01-6

Mol F.

: C20H31NO4

Mol W.

: 349.46

Cat No.

3-(Aminomethyl)-5-methyl-hexanoic Acid Phenylmethyl Ester Hydrochloride

3-[[[(1,1-Dimethylethoxy)carbonyl]amino]methyl]-5-methyl-hexanoic Acid Phenylmethyl Ester

3-[[[3-(Aminomethyl)-5-methyl-1-oxohexyl]amino]methyl]-5-methyl-hexanoic Acid

3-[[[3-[[[(1,1-Dimethylethoxy)carbonyl]amino]methyl]-5-methyl-1-oxohexyl]amino]methyl]-5-methyl-hexanoic Acid Phenylmethyl