Home / Products / Impurities

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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Impurities, Modafinil

Modafinil Related Compound C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 68524-30-1

Mol F.

: C15H15NOS

Mol W.

: 257.39999999999998

Cat No.

: SA42604

Impurities, Modafinil

Modafinil Related Compound D

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 574-42-5

Mol F.

: C26H22O

Mol W.

: 350

Cat No.

: SA42605

Impurities, Modafinil

Modafinil Related Compound E

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1726-02-9

Mol F.

: C26H22S2

Mol W.

: 398.6

Cat No.

: SA42606

Impurities, Molnupiravir

Molnupiravir IP Impurity G

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C16H26N4O8

Mol W.

: 402.4

Cat No.

: SA46215

Impurities, Molnupiravir

Molnupiravir IP Impurity H

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2346619-88-1

Mol F.

: C21H31N3O9

Mol W.

: 469.49

Cat No.

: SA46216

Impurities, Molnupiravir

Molnupiravir α-anomer

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C13H19N3O7

Mol W.

: 329.31

Cat No.

: SA46207

Mometasone

Mometasone Furoate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 83919-23-7

Mol F.

: C27H30Cl2O6

Mol W.

: 521.43

Cat No.

: SA28700

Impurities, Mometasone

Mometasone Furoate EP Impurity B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 223776-49-6

Mol F.

: C28H31ClO8S

Mol W.

: 563.06

Cat No.

: SA28702

Impurities, Varenicline

Mono amino deprotected varenicline Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 357424-22-7

Mol F.

: C11H14N2

Mol W.

: 174.24

Cat No.

: SA39512

Fingolimod, Impurities

mono O-Acetyl Fingolimod Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1807973-92-7

Mol F.

: C21H36ClNO3

Mol W.

: 385.97

Cat No.

: SA34518

Etravirine, Impurities

Monohydroxy Etravirine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1246815-68-8

Mol F.

: C20H15BrN6O2

Mol W.

: 451.28

Cat No.

: SA26104

Impurities, Tolterodine

Monoisopropyl tolterodine impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 194482-41-2

Mol F.

: C19H25NO

Mol W.

: 283.41000000000003

Cat No.

: SA28208

Impurities, Montelukast Sodium

Montelukast Mercapto Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 162515-68-6

Mol F.

: C6H10O2S

Mol W.

: 146.21

Cat No.

: SA44902

Fosaprepitant, Impurities

MORPHOLINE IMPURITY FOR APREPITANT (Oxalatae salt)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1242175-41-2

Mol F.

: C22H20F7NO6

Mol W.

: 527.4

Cat No.

: SA45426

Impurities, Moxifloxacin

Moxifloxacin

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 186826-86-8

Mol F.

: C21H24FN3O4

Mol W.

: 401.43

Cat No.

: SA30700

Impurities, Moxifloxacin

Moxifloxacin 7-Amino Impurity

$95.00 25 mg

PLEASE ENQUIRE

CAS No.

: 172426-88-9

Mol F.

: C₁₄H₁₃FN₂O₄

Mol W.

: 292.26

Cat No.

: SA30709

Impurities, Moxifloxacin

Moxifloxacin Difluoro Acid Impurity

$95.00 25 mg

PLEASE ENQUIRE

CAS No.

: 93107-30-3

Mol F.

: C13H9F2NO3

Mol W.

: 265.21

Cat No.

: SA30710

Impurities, Moxifloxacin

Moxifloxacin Difluoro Ethoxy Acid Impurity

$95.00 25 mg

PLEASE ENQUIRE

CAS No.

: 143158-55-8

Mol F.

: C15H13F2NO4

Mol W.

: 309.26

Cat No.

: SA30711

Impurities, Moxifloxacin

Moxifloxacin Difluoro Ethoxy Ethyl Ester

$125.00 25 mg

PLEASE ENQUIRE

CAS No.

: 172602-83-4

Mol F.

: C17H17F2NO4

Mol W.

: 337.32

Cat No.

: SA30712

Impurities, Moxifloxacin

Moxifloxacin Difluoro Hydroxy Ethyl Ester

$155.00 25 mg

PLEASE ENQUIRE

CAS No.

: 452092-31-8

Mol F.

: C15H13F2NO4

Mol W.

: 309.26

Cat No.

: SA30716

Impurities, Moxifloxacin

Moxifloxacin EP Impurity A

$155.00 25 mg

PLEASE ENQUIRE

CAS No.

: 151213-15-9

Mol F.

: C20H21F2N3O3

Mol W.

: 389.4

Cat No.

: SA30701

Impurities, Moxifloxacin

Moxifloxacin EP Impurity B

$255.00 25 mg

PLEASE ENQUIRE

CAS No.

: 1029364-73-5

Mol F.

: C22H27N3O5

Mol W.

: 413.47

Cat No.

: SA30702

Impurities, Moxifloxacin

Moxifloxacin EP Impurity C

$155.00 25 mg

PLEASE ENQUIRE

CAS No.

: 1029364-75-7

Mol F.

: C22H26FN3O4

Mol W.

: 415.46

Cat No.

: SA30703

Impurities, Moxifloxacin

Moxifloxacin EP Impurity D

$495.00 25 mg

PLEASE ENQUIRE

CAS No.

: 1029364-77-9

Mol F.

: C21H24FN3O4

Mol W.

: 401.43

Cat No.

: SA30704

Impurities, Moxifloxacin

Moxifloxacin EP Impurity E

$195.00 25 mg

PLEASE ENQUIRE

CAS No.

: 721970-36-1; 1292904-74-5 (HCl salt)

Mol F.

: C₂₀H₂₂FN₃O₄

Mol W.

: 387.4

Cat No.

: SA30705

Impurities, Ritlecitinib

N-((3R,6S)-1,6-dimethylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C13H19N5

Mol W.

: 245.32

Cat No.

: SA50002

Impurities, Ritlecitinib

N-((3R,6S)-6-methylpiperidin-3-yl)-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-amine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C12H19N5

Mol W.

: 233.31

Cat No.

: SA50003

Impurities, Ritlecitinib

N-((3R,6S)-6-methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine hydrochloride

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C12H18ClN5

Mol W.

: 267.76

Cat No.

: SA50004

Impurities, Nirmatrelvir

N-((S)-1-((1R,2S,5S)-2-Cyano-6,6-dimethyl-3-azabicyclo[3.1.0]hexan-3-yl)-3,3-dimethyl-1-oxobutan-2-yl)-2,2,2-trifluoroacetamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C16H22F3N3O2

Mol W.

: 345.4

Cat No.

: SA46909

Impurities, Ranitidine

N-(1-(2-((5-((dimethylamino)methyl)furan-2-yl)methylthio)ethylamino)-2-nitrovinyl)-N-methylnitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C13H21N5O4S

Mol W.

: 343.4

Cat No.

: SA26521

Impurities, Ranitidine

N-(2-(((5-((dimethylamino)methyl)furan-2-yl)methyl)thio)ethyl)-N-(1-(methylamino)-2-nitrovinyl)nitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C13H21N5O4S

Mol W.

: 343.4

Cat No.

: SA26520

Impurities, Osimertinib

N-(2-((2-(Dimethylamino)ethyl)(methyl)amino)-4-methoxy-5-((4-(1-methyl-1H-indol-3-yl)pyrimidin-2-yl)amino)phenyl)-3-((2-((2-(dimethylamino)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C53H64N14O3

Mol W.

: 945.19

Cat No.

: SA44703

Impurities, Osimertinib

N-(2-((2-(dimethylamino)ethyl)(methyl)amino)-4-methoxy-5-(4-(1-methyl-1H-indol-3-yl)pyrimidin-2-ylamino)phenyl)-N-(3-(2-((2-(dimethylamino)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C56H66N14O4

Mol W.

: 999.24

Cat No.

: SA44704

Impurities, Osimertinib

N-(2-((2-acrylamido-5-methoxy-4-(4-(1-methyl-1H-indol-3-yl)pyrimidin-2-ylamino)phenyl)(methyl)amino)ethyl)-3-(2-((2-(dimethylamino)ethyl)(m

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C56H67ClN14O4

Mol W.

: 1035.7

Cat No.

: SA44705

Impurities, Nitrosamine

N-(2-aminoethyl)-N-(2-((2-aminoethyl)amino)ethyl)nitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C6H17N5O

Mol W.

: 175.24

Cat No.

: SA44678

Impurities, Pazopanib

N-(2-Methoxypyrimidin-4-yl)-2,3-dimethyl-2H-indazol-6-amine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2369664-16-2

Mol F.

: C14H15N5O

Mol W.

: 269.3

Cat No.

: SA51314

Diclofenac, Impurities

N-(2,6-Dichlorophenyl)aniline

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 15307-93-4

Mol F.

: C₁₂H₉Cl₂N

Mol W.

: 238.11

Cat No.

: SA12708

Impurities, Ranolazine

N-(2,6-Dimethylphenyl)-2,2-dichloroacetamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 39084-88-3

Mol F.

: C10H11Cl2NO

Mol W.

: 232.11

Cat No.

: SA26816

Clonixin, Impurities

N-(3-Chloro-2-methylphenyl)-2-hydroxynicotinamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 72646-00-5

Mol F.

: C13H11ClN2O2

Mol W.

: 262.69

Cat No.

: SA38003

Cinnarizine, Impurities

N-(3-Phenyl)-2-propenyl Cinnarizine Chloride

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 95062-18-3

Mol F.

: C₃₅H₃₅ClF₂N₂

Mol W.

: 557.12

Cat No.

: SA12406

Etravirine, Impurities

N-(4-Amino-5-bromo-6-(4-cyano-2, 6-dimethylphenoxy)pyrimidin-2-yl)-N-(4-cyanophenyl)nitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C20H14BrN7O2

Mol W.

: 464.27

Cat No.

: SA26114

Brexpiprazole, Impurities

N-(4-Bromobutyl)-7-(4-bromobutoxy)-quinoline-2(1H)-one

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1076199-56-8

Mol F.

: C17H21Br2NO2

Mol W.

: 431.16

Cat No.

: SA41338

Etravirine, Impurities

N-(4-Cyanophenyl)guanidine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 5637-42-3

Mol F.

: C8H8N4

Mol W.

: 160.18

Cat No.

: SA26106

Brimonidine, Impurities

N-(4,5-Dihydro-1H-imidazol-2-yl)-5-methyl-6-quinolinamine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1217439-06-9

Mol F.

: C13H14N4

Mol W.

: 226.28

Cat No.

: SA20722

Impurities, Rosuvastatin

N-(5-(hydroxymethyl)-4-isopropyl-6-phenylpyrimidin-2-yl)-N-methylmethanesulfonamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C16H21N3O3S

Mol W.

: 335.42

Cat No.

: SA121120

Impurities, Palbociclib

N-(5-(piperazin-1-yl)pyridin-2-yl)hydroxylamine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C9H14N4O

Mol W.

: 194.24

Cat No.

: SA40434

Impurities, Rosuvastatin

N-(5-formyl-4-isopropyl-6-phenylpyrimidin-2-yl)-N-methylmethanesulfonamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C16H19N3O3S

Mol W.

: 333.41

Cat No.

: SA121122

Impurities, Palbociclib

N-(6-acetyl-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)-N-(5-(4-nitrosopiperazin-1-yl)pyridin-2-yl)nitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C24H27N9O4

Mol W.

: 505.53

Cat No.

: SA40425

Dorzolamide, Impurities

N-(6-Methyl-7,7-dioxido-2-sulfamoyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl)acetamide (C10H14N2O5S3) [338.4236 amu]

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 120298-38-6

Mol F.

: C10H14N2O5S3

Mol W.

: 338.42

Cat No.

: SA24120

Brimonidine, Impurities

N-(8-Bromo-6-quinoxalinyl)thiourea

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1217439-05-8

Mol F.

: C9H7BrN4S

Mol W.

: 283.15

Cat No.

: SA20720