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, Nitrosamine

N-[(2E)-6,6-Dimethyl- 2-hepten-4-yn-1-yl]- N-nitrosomethanamine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C10H16N2O

Mol W.

: 180.25

Cat No.

: SA446106

Impurities, Rosuvastatin

N-[(6S)-8-Fluoro-5,6-dihydro-4-(1-methylethyl)-6-[(2S,4S)-tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl]benzo[h]quinazolin-2-yl]-N-methylmethanesulfonamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA12168

Impurities, Nizatidine

N-[2[[[2-[(dimethylamino)methyl]-4-thiazolyl]methyl]thio]ethyl]-2-nitro-1-thiomethyl etheneamine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C12H18N4O2S3

Mol W.

: 346.5

Cat No.

: SA34417

Abacavir, Impurities

N-[4,6-Dichloro-5-(formylamino)-2-pyrimidinyl]acetamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 136470-91-2

Mol F.

: C7H6Cl2N4O2

Mol W.

: 249.05

Cat No.

: SA18111

Cariprazine, Impurities

N-[trans-4-(2-Oxoethyl)cyclohexyl]carbamic Acid 1,1-Dimethylethyl Ester

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 215790-29-7

Mol F.

: C13H23NO3

Mol W.

: 241.33

Cat No.

: SA39709

Gabapentin, Impurities

N-3-oxobutyl Gabapentin lactum

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C₁₃H₂₁NO₂

Mol W.

: 223.31

Cat No.

: SA22817

Efavirenz, Impurities

N-4-methoxypheny open ring Efavirenz

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 173676-60-3

Mol F.

: C₂₁H₁₉ClF₃NO₂

Mol W.

: 409.83

Cat No.

: SA17611

Impurities, Linezolid

N-acetyl -(3-(3-fluoro-4-morpholinophenylamino)propyl)-N-(((S3(3-fluoro-4-morpholionphenyl)-2-oxo-5-oxazolidinyl)methyl)amine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C29H37F2N5O5

Mol W.

: 573.63

Cat No.

: SA17505

Amoxicillin, Impurities

N-Acetyl Amoxicilloic Acid

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C18H23N3O7S

Mol W.

: 425.46

Cat No.

: SA15307

Clonidine, Impurities

N-Acetyl Clonidine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 54707-71-0

Mol F.

: C11H11Cl2N3O

Mol W.

: 272.13

Cat No.

: SA42503

Fingolimod, Impurities

N-Acetyl Diethyl Ester Fingolimod Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 162358-08-9

Mol F.

: C25H39NO5

Mol W.

: 433.58

Cat No.

: SA34514

Dorzolamide, Impurities

N-Acetyl Dorzolamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 403848-09-9

Mol F.

: C12H18N2O5S3

Mol W.

: 366.48

Cat No.

: SA24115

Impurities, Penciclovir

N-acetyl esterified Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C16H20ClN5O5

Mol W.

: 397.81

Cat No.

: SA27709

Ganciclovir, Impurities

N-Acetyl-di-O-acetyl Ganciclovir

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 86357-14-4

Mol F.

: C₁₅H₁₉N₅O₇

Mol W.

: 381.34

Cat No.

: SA13704

Impurities, Linagliptin

N-Aminoacyl Linagliptin

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2983074-55-9

Mol F.

: C26H29N9O3

Mol W.

: 515.6

Cat No.

: SA49918

Impurities, Lenalidomide

N-Aminopropanoyl Lenalidomide Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C16H18N4O4

Mol W.

: 330.34

Cat No.

: SA34106

Impurities, Sitagliptin

N-Benzyl carbamate Sitagliptin

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C24H19F6N5O4

Mol W.

: 555.43

Cat No.

: SA10430

Ciprofloxacin, Impurities

N-Benzyl Ciprofloxacin Benzyl Ester

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1391052-64-4

Mol F.

: C31h30FN3O3

Mol W.

: 511.59

Cat No.

: SA42009

Impurities, Nitrosamine

N-Benzyl-N-ethylnitrous amide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 20689-96-7

Mol F.

: C9H12N2O

Mol W.

: 164.2

Cat No.

: SA44695

Impurities, Isavuconazole

N-Boc Isavuconazonium Impurity

$400.00 25 mg

PLEASE ENQUIRE

CAS No.

: 338990-63-9; 741241-71-4 (free base); 338990-64-0 (Iodide salt)

Mol F.

: C40H43ClF2N8O7S

Mol W.

: 853.33

Cat No.

: SA44116

Impurities, Venlafaxine

N-Boc N,O-Didesmethylvenlafaxine

$1,555.00 100 mg

PLEASE ENQUIRE

CAS No.

: 1076199-24-0

Mol F.

: C20H31NO4

Mol W.

: 349.46

Cat No.

: SA22721

Impurities, Risdiplam

N-Boc Risdiplam | CAS : 2133298-74-3

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2133298-74-3

Mol F.

: C27H31N7O3

Mol W.

: 501.58

Cat No.

: SA52310

Impurities, Saxagliptin

N-Boc-L-cis-4,5-Methanoprolineamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 361440-67-7

Mol F.

: C11H18N2O3

Mol W.

: 226.27

Cat No.

: SA27401

Dapoxetine, Impurities

N-Boc-N-desmethyl Dapoxetine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C25H29NO3

Mol W.

: 391.5

Cat No.

: SA23005

Brexpiprazole, Impurities

N-butyl bromide Quinolinone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C13H14BrNO2

Mol W.

: 296.16

Cat No.

: SA41309

Eslicarbazepine, Impurities

N-Carbamoyl Oxcarbazepine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C16H13N3O3

Mol W.

: 295.29

Cat No.

: SA28804

Ganciclovir, Impurities

N-Carbobenzyloxy-L-valinyl-ganciclovir

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 194154-40-0

Mol F.

: C₂₂H₂₈N₆O₇

Mol W.

: 488.49

Cat No.

: SA13702

Ciprofloxacin, Impurities

N-Cyclopropy Analog

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1502292-84-3

Mol F.

: C10H12FNO

Mol W.

: 181.21

Cat No.

: SA42011

Dapoxetine, Impurities

N-Demethyl Dapoxetine Hydrochloride

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 119357-18-5

Mol F.

: C20H22ClNO

Mol W.

: 327.85

Cat No.

: SA23006

Impurities, Linezolid

N-Desacetyl-N,O-descarbonyl O-Acetyl Linezolid

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 333753-71-2

Mol F.

: C₁₅H₂₂FN₃O₃

Mol W.

: 311.35

Cat No.

: SA17509

Brinzolamide, Impurities

N-Desethyl Brinzolamide Impurity; Brinzolamide USP Related Compound B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 404034-55-5

Mol F.

: C10H17N3O5S3

Mol W.

: 355.45

Cat No.

: SA47204

Impurities, Metoclopramide

N-Desethyl Metoclopramide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 27260-19-1

Mol F.

: C₁₂H₁₈ClN₃O₂

Mol W.

: 271.74

Cat No.

: SA30610

Impurities, Sunitinib

N-Desethyl N-Butoxycarbonyl Sunitinib

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1246833-23-7

Mol F.

: C25H31FN4O4

Mol W.

: 740.54

Cat No.

: SA39601

Dasatinib, Impurities

N-Deshydroxyethyl Dasatinib

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 910297-51-7

Mol F.

: C20H22ClN7OS

Mol W.

: 443.95

Cat No.

: SA40505

Impurities, Terbinafine

N-Desmethyl cis-Terbinafine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 114311-72-7

Mol F.

: C20H23N

Mol W.

: 277.70999999999998

Cat No.

: SA25720

Impurities, Terbinafine

N-Desmethyl hydroxy terbinafine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 162227-14-7

Mol F.

: C20H23NO

Mol W.

: 293.4

Cat No.

: SA25709

Impurities, Lercanidipine

N-Desmethyl Lercanidipine N-Nitroso

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C35H38N4O7

Mol W.

: 626.7

Cat No.

: SA50917

Doxepin, Impurities

N-Desmethyl N-Ethyl Doxepin

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 70805-90-2

Mol F.

: C20H23NO

Mol W.

: 293.39

Cat No.

: SA29905

Impurities, Rosuvastatin

N-Desmethyl N-ethyl Rosuvastatin Sodium Salt

$1,950.00 25 mg

PLEASE ENQUIRE

CAS No.

Mol F.

: C23H29FN3NaO6S

Mol W.

: 517.55

Cat No.

: SA12139

Impurities, Ondansetron

N-Desmethyl Ondansetron

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 9614-14-9

Mol F.

: C17H17N3O

Mol W.

: 279.33999999999997

Cat No.

: SA35808

Impurities, Ribociclib

N-Desmethyl Ribociclib

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1211441-59-6

Mol F.

: C22H28N8O

Mol W.

: 420.52

Cat No.

: SA47104

Impurities, Riociguat

N-Desmethyl Riociguat

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 625115-49-3

Mol F.

: C20H19FN8O2

Mol W.

: 422.4

Cat No.

: SA50806

Impurities, Rosuvastatin

N-Desmethyl Rosuvastatin Disodium Salt Monohydrate

$750.00 25 mg

PLEASE ENQUIRE

CAS No.

: 371775-74-5(Acid)

Mol F.

: C21H23FN3Na2O7S

Mol W.

: 529.49

Cat No.

: SA12119

Impurities, Rosuvastatin

N-Desmethyl Rosuvastatin Lactone

$750.00 25 mg

PLEASE ENQUIRE

CAS No.

: 1797419-58-9

Mol F.

: C21H24FN3O5S

Mol W.

: 449.5

Cat No.

: SA12138

Impurities, Tamoxifen

N-Desmethyl Tamoxifen

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 15917-65-4;31750-48-8

Mol F.

: C25H27NO

Mol W.

: 357.49

Cat No.

: SA35506

Impurities, Ulipristal

N-Desmethyl Ulipristal

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 159681-67-1

Mol F.

: C27H33NO3

Mol W.

: 419.55

Cat No.

: SA27905

Impurities, Ulipristal

N-Desmethyl Ulipristal Acetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 159681-66-0

Mol F.

: C29H35NO4

Mol W.

: 461.59

Cat No.

: SA27903

Doxepin, Impurities

N-Desmethyl-N-formyl Doxepin

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 250331-52-3

Mol F.

: C19H19NO2

Mol W.

: 293.36

Cat No.

: SA29908

Impurities, Pioglitazone

N-Ethyl Pioglitazone Impurity | CAS : 1333110-38-5

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1333110-38-5

Mol F.

: C21H24N2O3S

Mol W.

: 384.5

Cat No.

: SA52816

Impurities, Nitrosamine

N-Ethyl-N-(3-carboxypropyl)nitrosamine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 54897-63-1

Mol F.

: C6H12N2O3

Mol W.

: 160.16999999999999

Cat No.

: SA44648