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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, Sofosbuvir

2′-Alkene Mono-N-Benzoyl Sofosbuvir

$695.00 25 mg

In Stock

CAS No.

Mol F.

: C17H17N3O5

Mol W.

: 343.33

Cat No.

: SA15431

Impurities, Sofosbuvir

2′-Alkene Sofosbuvir; 2’-Defluro-2’-methylene Sofosbuvir

$795.00 25 mg

In Stock

CAS No.

: 2095551-20-3

Mol F.

: C22H28N3O9P

Mol W.

: 509.46

Cat No.

: SA15411

Impurities, Sofosbuvir

2′-Hydroxy Sofosbuvir

$595.00 25 mg

In Stock

CAS No.

: 1987957-11-8

Mol F.

: C22H30N3O10P

Mol W.

: 527.47

Cat No.

: SA15409

Impurities, Sofosbuvir

2′-S-Fluoro sofosbuvir; 2’-epi-Sofosbuvir

$595.00 25 mg

In Stock

CAS No.

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15406

Dexamethasone, Impurities

21-Carboxy Dexamethasone

$255.00 25 mg

In Stock

CAS No.

: 84449-15-0

Mol F.

: C22H27FO6

Mol W.

: 406.5

Cat No.

: SA15531

Impurities, Triamcinolone Acetonide

21-Carboxylic Acid Triamcinolone Acetonide

$395.00 25 mg

In Stock

CAS No.

: 53962-41-7

Mol F.

: C24H29FO7

Mol W.

: 448.48

Cat No.

: SA30216

Hydrocortisone, Impurities

21-Chlorooxenol

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C21H29ClO4

Mol W.

: 380.91

Cat No.

: SA15226

Dexamethasone, Impurities

21-Dehydro Dexamethasone Hydrate

Please enquire for price & pack size

In Stock

CAS No.

: 2964-79-6

Mol F.

: C22H29FO6

Mol W.

: 408.46

Cat No.

: SA15505

Hydrocortisone, Impurities

21-Dehydrocortiicosterone

Please enquire for price & pack size

In Stock

CAS No.

: 20287-97-2

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA15228

Cortisone Acetate, Impurities

21-Dehydrocortisone

Please enquire for price & pack size

In Stock

CAS No.

: 16574-04-2

Mol F.

: C21H26O5

Mol W.

: 358.4

Cat No.

: SA43204

Desoximetasone, Impurities

21-Dehydroxy 8DM

Please enquire for price & pack size

In Stock

CAS No.

: 59796-52-0

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA19210

Desoximetasone, Impurities

21-Dehydroxy Desoxymetasone

Please enquire for price & pack size

In Stock

CAS No.

: 184899-80-7

Mol F.

: C22H29FO3

Mol W.

: 360.46

Cat No.

: SA19207

Dexamethasone, Impurities

21-Deoxydexamethasone

Please enquire for price & pack size

In Stock

CAS No.

: 426-15-3

Mol F.

: C22H29FO4

Mol W.

: 376.47

Cat No.

: SA15532

Dexamethasone, Impurities

21-O-Acetyl Dexamethasone 9,11-Epoxide

Please enquire for price & pack size

In Stock

CAS No.

: 2884-51-7

Mol F.

: C₂₄H₃₀O₆

Mol W.

: 414.49

Cat No.

: SA15524

Impurities, Isavuconazole

2S, 3S N-Boc Isavuconazonium Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C40H43F2N8O7S+

Mol W.

: 817.88

Cat No.

: SA44136

Impurities, Isavuconazole

2S,3S-Isavuconazole

$1,550.00 25 mg

In Stock

CAS No.

Mol F.

: C22H17F2N5OS

Mol W.

: 437.5

Cat No.

: SA44110

Ethisterone, Impurities

2α-cyano ethisterone

Please enquire for price & pack size

In Stock

CAS No.

: 13648-12-9

Mol F.

: C22H27NO2

Mol W.

: 337.45

Cat No.

: SA12901

Impurities, Testosterone

2α-Hydroxytestosterone

Please enquire for price & pack size

In Stock

CAS No.

: 4075-14-3

Mol F.

: C19H28O3

Mol W.

: 304.42

Cat No.

: SA16218

Bromfenac, Impurities

3- Bromo bromfenac isomer

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C15H11BrNNaO3

Mol W.

: 356.15

Cat No.

: SA18915

Cabergoline, Impurities

3-((6aR,9R,10aR)-7-allyl-N-(ethylcarbamoyl)-4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg]quinoline-9-carboxamido)-N,N-dimethylpropan-1-amine oxide

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C26H37N5O3

Mol W.

: 467.60

Cat No.

: SA51801

Impurities, Neostigmine

3-(methyl amino)phenol

Please enquire for price & pack size

In Stock

CAS No.

: 14703-69-6

Mol F.

: C7H9NO

Mol W.

: 123.155

Cat No.

: SA19704

Celecoxib, Impurities

3-(Trifluoromethyl)-5-p-tolyl-1H-pyrazole

Please enquire for price & pack size

In Stock

CAS No.

: 219986-64-8

Mol F.

: C11H9F3N2

Mol W.

: 226.2

Cat No.

: SA11301

Impurities, Sitagliptin

3-(Trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine Hydrochloride (TPP)

$95.00 25 mg

In Stock

CAS No.

: 762240-92-6

Mol F.

: C₆H₈ClF₃N₄

Mol W.

: 228.6

Cat No.

: SA10441

Apremilast, Impurities

3-Aminophthalic acid hydrochloride

$79.00 25 mg

In Stock

CAS No.

: 5434-20-8

Mol F.

: C8H8ClNO4

Mol W.

: 217.61

Cat No.

: SA30016

Impurities, Sitagliptin

3-Boc-amino-4-2, 4, 5-trifluorophenyl)butyric Acid

Please enquire for price & pack size

In Stock

CAS No.

: 1620129-74-9

Mol F.

: C15H18F3NO4

Mol W.

: 333.3

Cat No.

: SA10457

Clotrimazole, Impurities

3-Chlorobenzotrichloride

Please enquire for price & pack size

In Stock

CAS No.

: 2136-81-4

Mol F.

: C7H4Cl4

Mol W.

: 229.92

Cat No.

: SA11602

Clomipramine, Impurities

3-Chloroiminodibenzyl

$95.00 25 mg

In Stock

CAS No.

: 32943-25-2

Mol F.

: C14H12ClN

Mol W.

: 229.7

Cat No.

: SA33703

Bupropion, Impurities

3-Chloropropiophenone

$90.00 50 mg

In Stock

CAS No.

: 936-59-4

Mol F.

: C9H9ClO

Mol W.

: 168.62

Cat No.

: SA12232

Cortisone Acetate, Impurities

3-Enol Ether Cortisone Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 1852-65-9

Mol F.

: C25H34O6

Mol W.

: 430.5

Cat No.

: SA43200

Empagliflozin, Impurities

3-Epi Empagliflozin (R-Isomer)

$199.00 10 mg

In Stock

CAS No.

: 864070-43-9

Mol F.

: C23H27ClO7

Mol W.

: 450.91

Cat No.

: SA15113

Apremilast, Impurities

3-Ethoxy-4-methoxybenzonitrile

$79.00 50 mg

In Stock

CAS No.

: 60758-86-3

Mol F.

: C10H11NO2

Mol W.

: 177.2

Cat No.

: SA30018

Erlotinib, Impurities

3-Ethynylaniline

Please enquire for price & pack size

In Stock

CAS No.

: 54060-30-9

Mol F.

: C8H7N

Mol W.

: 117.15

Cat No.

: SA25224

Atorvastatin, Impurities

3-Fluoro Atorvastatin

$190.00 25 mg

In Stock

CAS No.

Mol F.

: C33H34FN2NaO5

Mol W.

: 580.62

Cat No.

: SA17802

Atorvastatin, Impurities

3-fluro diketoatorvastatin derivative

$500.00 250 mg

In Stock

CAS No.

Mol F.

: C26H24FNO3

Mol W.

: 417.47

Cat No.

: SA17804

Impurities, Sitagliptin

3-Hydroxy Sitagliptin

$99.00 25 mg

In Stock

CAS No.

: 1253056-01-7

Mol F.

: C16H14F6N4O2

Mol W.

: 408.3

Cat No.

: SA10406

Impurities, Saxagliptin

3-hydroxy-1-adamantyl-D-glycine

Please enquire for price & pack size

In Stock

CAS No.

: 709031-29-8

Mol F.

: C12H19NO3

Mol W.

: 225.28

Cat No.

: SA27418

Aminocaproic Acid, Impurities

3-hydroxy-3,4-dicarboxy-butanamide-N hexanoic acid

Please enquire for price & pack size

In Stock

CAS No.

: 1675217-42-1

Mol F.

: C12H19NO8

Mol W.

: 305.28

Cat No.

: SA22610

Apremilast, Impurities

3-Hydroxy-4-methoxybenzonitrile

$79.00 25 mg

In Stock

CAS No.

: 52805-46-6

Mol F.

: C8H7NO2

Mol W.

: 149.1

Cat No.

: SA30017

Diltiazem, Impurities

3-Methoxyphenyl-O-Desacetyl-N-desmethyl Diltiazem

$1,395.00 25 mg

In Stock

CAS No.

Mol F.

: C19H22N2O3S

Mol W.

: 358.46

Cat No.

: SA19503

Apixaban, Impurities

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

$145.00 25 mg

In Stock

CAS No.

: 545445-44-1

Mol F.

: C20H25O3N3

Mol W.

: 355.43

Cat No.

: SA39926

Apixaban, Impurities

3-Morpholino-1-(4-(2-oxopiperidin-1-yl)phenyl)pyridin-2(1H)-one

Please enquire for price & pack size

In Stock

CAS No.

: 2413365-22-5

Mol F.

: C20H23N3O3

Mol W.

: 353.41

Cat No.

: SA39948

Apremilast, Impurities

3-Nitrophthalic acid

$79.00 25 mg

In Stock

CAS No.

: 603-11-2

Mol F.

: C₈H₅NO₆

Mol W.

: 211.13

Cat No.

: SA30013

Impurities, Naloxone

3-O-Allylnaloxone

Please enquire for price & pack size

In Stock

CAS No.

: 1352085-46-1

Mol F.

: C22H25NO4

Mol W.

: 367.44

Cat No.

: SA45105

Brimonidine, Impurities

3,4-Dinitrobenzoic Acid

$80.00 25 mg

In Stock

CAS No.

: 528-45-0

Mol F.

: C7H4N2O6

Mol W.

: 212.12

Cat No.

: SA20723

Clindamycin, Impurities

3,4-O-Isopropylidene Clindamycin

Please enquire for price & pack size

In Stock

CAS No.

: 147650-54-2

Mol F.

: C21H37ClN2O5S

Mol W.

: 465.05

Cat No.

: SA29712

Bupropion, Impurities

3’-Chloro-2-bromopropiophenone

Please enquire for price & pack size

In Stock

CAS No.

: 34911-51-8

Mol F.

: C9H8BrClO

Mol W.

: 247.52

Cat No.

: SA12233

Ezetimibe

3′-(2-Fluorophenyl) Ezetimibe; O-fluorobenzene ezetimibe

$175.00 10 mg

In Stock

CAS No.

: 2743547-96-6

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14811

Bupropion, Impurities

3′-Chloropropiophenone

$110.00 25 mg

In Stock

CAS No.

: 34841-35-5

Mol F.

: C9H9ClO

Mol W.

: 168.62

Cat No.

: SA12231

Ezetimibe, Impurities

3′-deshydroxy ezetimibe acid

$595.00 25 mg

In Stock

CAS No.

Mol F.

: C24H23F2NO3

Mol W.

: 411.44

Cat No.

: SA14840

Impurities, Sofosbuvir

3′-S Sofosbuvir isomer

$795.00 25 mg

In Stock

CAS No.

Mol F.

: C22H29FN3O9P

Mol W.

: 529.45

Cat No.

: SA15433