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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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Impurities, Intermediates

4-Tolylboronic acid MIDA Ester

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CAS No.

: 943552-01-0

Mol F.

: C12H14BNO4

Mol W.

: 247.05

Cat No.

: SRC900136

Impurities, Intermediates

4-Vinyl Phenylboronic Acid MIDA Ester

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CAS No.

: 1422172-82-4

Mol F.

: C13H14BNO4

Mol W.

: 259.07

Cat No.

: SRC900141

Gemcitabine, Impurities

4,4-Difluoro-2-(hydroxymethyl)-5-oxotetrahydrofuran-3-yl benzoate

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CAS No.

: NA

Mol F.

: C12H10F2O5

Mol W.

: 272.2

Cat No.

: SA44510

Epinephrine, Impurities

4,4′-(Piperazine-2,5-diyl)dibenzene-1,2-diol

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CAS No.

Mol F.

: C16H18N2O4

Mol W.

: 302.33

Cat No.

: SA46500

Impurities, Sulfamethoxazole

4,4’-Azoxybis[N-(5-methyl-3-isoxazolyl)-benzenesulfonamide

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CAS No.

: 119403-03-1

Mol F.

: C20H18N6O7S2

Mol W.

: 518.52

Cat No.

: SA25509

Dapsone, Impurities

4,4’-Dichlorodiphenyl Sulfone

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CAS No.

: 80-07-9

Mol F.

: C12H8Cl2O2S2

Mol W.

: 287.16

Cat No.

: SA27012

Impurities, Prednisone

4,5-Dihydro Prednisone

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CAS No.

: 103881-93-2

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA26210

Impurities, Topiramate

4,5-O-(1-Methylethylidene)-β-D-fructopyranose

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CAS No.

: 912456-61-2

Mol F.

: C9H16O6

Mol W.

: 220.22

Cat No.

: SA45513

Impurities, Vericiguat

4,6-Diamino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-5-((methoxycarbonyl)amino)pyrimidine 1-oxide

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CAS No.

Mol F.

: C19H16F2N8O3

Mol W.

: 442.4

Cat No.

: SA50705

Allopurinol, Impurities

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine

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CAS No.

: 2465-59-0

Mol F.

: C5H4N4O2

Mol W.

: 152.11

Cat No.

: SA28912

Allopurinol, Impurities

4,6-Dimethoxy-1H-pyrazolo[3,4-d]pyrimidine

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CAS No.

: 98277-30-6

Mol F.

: C7H8N4O2

Mol W.

: 180.16

Cat No.

: SA28914

Hydroxychloroquine, Impurities

4,7-Dichloroquine

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CAS No.

: 58175-86-3

Mol F.

: C18H26ClN3

Mol W.

: 319.87

Cat No.

: SA23803

Impurities, Pregabalin

4,9-Diisobutyl-1,6-diazecane-2,7-dione

$395.00 25 mg

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CAS No.

: 1990538-03-8

Mol F.

: C16H30N2O2

Mol W.

: 282.42

Cat No.

: SA24832

Fenofibrate, Impurities

4’-Chloro-3-hydroxy-benzophenone

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CAS No.

: 62810-39-3

Mol F.

: C13H9ClO2

Mol W.

: 232.66

Cat No.

: SA27210

Flurbiprofen, Impurities

4’-Hydroxy Flurbiprofen

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CAS No.

: 52807-12-2

Mol F.

: C15H13FO3

Mol W.

: 260.26

Cat No.

: SA14612

Impurities, Raloxifene

4’-tert-Butyldimethylsilyl-6-hydroxy Raloxifene

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CAS No.

: 174264-46-1

Mol F.

: C34H41NO4SSi

Mol W.

: 587.85

Cat No.

: SA24908

Building Blocks, Impurities

5-((trimethylsilyl)ethynyl)pyridin-2-amine

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CAS No.

Mol F.

: C10H14N2Si

Mol W.

: 190.32

Cat No.

: SB10706

Impurities, Palbociclib

5-(1-Piperazinyl)-2-pyridinamine

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CAS No.

: 1082876-26-3

Mol F.

: C9H14N4

Mol W.

: 178.23

Cat No.

: SA40406

Impurities, Irbesartan

5-[1,1’-Biphenyl]-2-yl-2H-tetrazole

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CAS No.

: 147330-32-3

Mol F.

: C13H10N4

Mol W.

: 222.25

Cat No.

: SA23314

Impurities, Raloxifene

5-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene

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CAS No.

Mol F.

: C42H44N2O6S

Mol W.

: 704.87

Cat No.

: SA24914

Impurities, Olmesartan Medoxomil

5-[4’-Bromomethyl-(1,1’-biphenyl)-2-yl]-2-triphenylmethyltetrazole

$125.00 25 mg

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CAS No.

: 133051-88-4

Mol F.

: C33H25BrN4

Mol W.

: 557.5

Cat No.

: SA17726

Impurities, Olmesartan Medoxomil

5-[4′-(Bromomethyl)-1,1′-biphenyl-2-yl]-1-triphenylmethyl-1H-tetrazole

$95.00 25 mg

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CAS No.

: 124750-51-2

Mol F.

: C33H25BrN4

Mol W.

: 557.5

Cat No.

: SA17725

Impurities, Oxcarbazepine

5-Acetyl-5,11-dihydro-10H-dibenz[b,f]azepin-10-one

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CAS No.

: 28291-63-6

Mol F.

: C16H13NO2

Mol W.

: 251.28

Cat No.

: SA12516

Impurities, Olmesartan Medoxomil

5-acetylimidazole-4-carbonitriles

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CAS No.

Mol F.

: C9H11N3O

Mol W.

: 177.2

Cat No.

: SA17741

Impurities, Lamivudine

5-Acetyloxy-1,3-oxathiolane-2-carboxylic Acid

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CAS No.

: 440105-45-3

Mol F.

: C6H8O5S

Mol W.

: 192.19

Cat No.

: SA22314

Clomipramine, Impurities

5-Allyl-3-Chloroiminodibenzyl

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CAS No.

: 1425793-87-8

Mol F.

: C17H16ClN

Mol W.

: 269.77

Cat No.

: SA33707

Allopurinol, Impurities

5-Amino-4-pyrazolecarboxamide

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CAS No.

: 5334-31-6

Mol F.

: C4H6N4O

Mol W.

: 126.12

Cat No.

: SA28909

Azacitidine, Impurities

5-Azacytidine 2’,3’5’-O-triacetate

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CAS No.

: 10302-78-0

Mol F.

: C14H18N4O8

Mol W.

: 370.31

Cat No.

: SA37505

Dapagliflozin, Impurities

5-Bromo-2-chlorobenzoic Acid

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CAS No.

: 21739-92-4

Mol F.

: C7H4BrClO2

Mol W.

: 235.46

Cat No.

: SA15019

Impurities, Ribociclib

5-Bromo-4-chloro-N-cyclopentylpyrimidin-2-amine

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CAS No.

: 1823404-28-9

Mol F.

: C9H11BrClN3

Mol W.

: 276.56

Cat No.

: SA47110

Brimonidine, Impurities

5-Bromo-6-(1H-imidazol-4-yl)quinoxaline

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CAS No.

: NA

Mol F.

: C11H7BrN4

Mol W.

: 275.10000000000002

Cat No.

: SA20718

Brimonidine, Impurities

5-bromo-6-isothiocyanatoquinoxaline

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CAS No.

: 134892-46-9

Mol F.

: C9H4BrN3S

Mol W.

: 266.12

Cat No.

: SA20717

Brimonidine, Impurities

5-Bromo-N-propylquinoxalin-2-amine

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CAS No.

: NA

Mol F.

: C11H12BrN3

Mol W.

: 266.14

Cat No.

: SA20721

Apixaban, Impurities

5-Bromopentanoyl chloride

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CAS No.

: 4509-90-4

Mol F.

: C5H8BrClO

Mol W.

: 99.47

Cat No.

: SA39954

Impurities, Nintedanib

5-Carboxymethyl Desmethyl Acetamido Nintedanib

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CAS No.

Mol F.

: C30H31N5O4

Mol W.

: 525.6

Cat No.

: SA22527

Apixaban, Impurities

5-Chlorohexanoyl chloride

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CAS No.

: 99585-01-0

Mol F.

: C6H10Cl2O

Mol W.

: 169.05

Cat No.

: SA39955

Apixaban, Impurities

5-Chloropentanoyl chloride

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CAS No.

: 1575-61-7

Mol F.

: C5H8Cl2O

Mol W.

: 155

Cat No.

: SA39924

Capecitabine, Impurities

5-Deoxy-D-ribose

$350.00 25 mg

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CAS No.

: 13039-75-3

Mol F.

: C₅H₁₀O₄

Mol W.

: 134.13

Cat No.

: SA37811

Impurities, Losartan

5-Deshydroxymethyl-5-chloro Losartan

$695.00 25 mg

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CAS No.

: 1159977-26-0

Mol F.

: C21H20Cl2N6

Mol W.

: 427.33

Cat No.

: SA26722

Empagliflozin, Impurities

5-DiTHF Empagliflozin impurity

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CAS No.

Mol F.

: C27H33ClO8

Mol W.

: 521

Cat No.

: SA15133

Emtricitabine, Impurities

5-epi Emtricitabine Carboxylic Acid; Emtricitabine IP Impurity A

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CAS No.

: 1238210-10-0

Mol F.

: C₈H₈FN₃O₄S

Mol W.

: 261.23

Cat No.

: SA22902

Emtricitabine, Impurities

5-Fluoro Cytosine

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CAS No.

: 2022-85-7

Mol F.

: C4H4FN3O

Mol W.

: 129.09

Cat No.

: SA22919

Emtricitabine, Impurities

5-Fluoro Uracil

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CAS No.

: 51-21-8

Mol F.

: C4H3FN2O2

Mol W.

: 130.08000000000001

Cat No.

: SA22920

Impurities, Vericiguat

5-Fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxamide

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CAS No.

: 1361232-73-6

Mol F.

: C14H10F2N4O

Mol W.

: 288.26

Cat No.

: SA50707

Impurities, Salbutamol

5-Hydroxy Albuterol

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CAS No.

: 182676-90-0

Mol F.

: C13H21NO4

Mol W.

: 255.31

Cat No.

: SA26016

Impurities, Leflunomide

5-Hydroxy Leflunomide

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CAS No.

: 1058722-46-5

Mol F.

: C12H9F3N2O3

Mol W.

: 286.20999999999998

Cat No.

: SA21809

Impurities, Valsartan

5-Hydroxy Valsartan

$995.00 100 mg

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CAS No.

: 1186103-57-0

Mol F.

: C24H29N5O4

Mol W.

: 451.52

Cat No.

: SA33306

Impurities, Rosuvastatin

5-Hydroxyde((3R,5R)-3,5-dihydroxyhexanoate) Rosuvastatin

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CAS No.

: 371775-71-2

Mol F.

: C15H18FN3O3S

Mol W.

: 339.39

Cat No.

: SA12144

Impurities, Isoquinoline

5-methoxy-3,4-dihydroisoquinoline

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CAS No.

: 1355060-40-0

Mol F.

: C10H11NO

Mol W.

: 161.19999999999999

Cat No.

: SA19301

Deferasirox, Impurities

5-Methoxycarbonyl Deferasirox

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CAS No.

: 1395346-29-8

Mol F.

: C23H17N3O6

Mol W.

: 431.4

Cat No.

: SA25111