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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity G

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In Stock

CAS No.

: 38002-18-5

Mol F.

: C20H22O3

Mol W.

: 310.39

Cat No.

: SA13104

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity I

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In Stock

CAS No.

: 67703-68-8

Mol F.

: C20H22O2

Mol W.

: 294.39

Cat No.

: SA13106

Formoterol, Impurities

Ethoxy Formoterol Impurity

$400.00 25 mg

In Stock

CAS No.

Mol F.

: C21H28N2O4

Mol W.

: 372.5

Cat No.

: SA21112

Impurities, Sofosbuvir

Ethoxy Sofosbuvir Impurity

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In Stock

CAS No.

: 2164516-85-0

Mol F.

: C21H27FN3O9P

Mol W.

: 515.42999999999995

Cat No.

: SA15442

Impurities, Rosuvastatin

Ethyl (S)-4-Chloro-3-hydroxybutyrate

$80.00 100 mg

In Stock

CAS No.

: 86728-85-0

Mol F.

: C6H11ClO3

Mol W.

: 166.6

Cat No.

: SA121115

Impurities, Ticagrelor

Ethyl 2-((3aR,4S,6R,6aS)-6-(benzyloxycarbonyl)-2,2-dimethyl-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yloxy)acetate

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In Stock

CAS No.

: 866551-95-3

Mol F.

: C20H27NO7

Mol W.

: 393.43

Cat No.

: SA32510

Febuxostat, Impurities

Ethyl 2-(3-Formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate

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In Stock

CAS No.

: 161798-01-2

Mol F.

: C₁₄H₁₃NO₄S

Mol W.

: 291.32

Cat No.

: SA32003

Erlotinib, Impurities

Ethyl 2-amino-4,5-bis(2-methoxyethoxy)benzoate hydrochloride

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In Stock

CAS No.

: 183322-17-0

Mol F.

: C15H24ClNO6

Mol W.

: 349.81

Cat No.

: SA25231

Apixaban, Impurities

Ethyl 2-chloro-2-(2- phenylhydrazono)acetate

$90.00 25 mg

In Stock

CAS No.

: 28663-68-5

Mol F.

: C10H11ClN2O2

Mol W.

: 226.66

Cat No.

: SA39942

Aciclovir, Impurities

Ethyl 3-[(5-chloro-2-nitrophenyl)phenylamino]-3-oxopropionate

$195.00 25 mg

In Stock

CAS No.

: 22316-45-6

Mol F.

: C17H15ClN2O5

Mol W.

: 362.76

Cat No.

: SA21404

Dapagliflozin, Impurities

Ethyl Dapagliflozin Impurity

$175.00 10 mg

In Stock

CAS No.

Mol F.

: C23H29ClO6

Mol W.

: 436.93

Cat No.

: SA15032

Apixaban, Impurities

Ethyl-2-chloro-2-(2-(4-methoxyphenyl)hydrazono)acetate

$90.00 25 mg

In Stock

CAS No.

: 27143-07-3

Mol F.

: C11H13ClN2O3

Mol W.

: 256.7

Cat No.

: SA39923

Impurities, Olmesartan Medoxomil

Ethyl-4-(prop-1-ene-2-yl)2-propyl-1H-imidazole-5-carboxylate; Ethyl-4-(Prop-1-en-2-yl)-2-propyl

$155.00 25 mg

In Stock

CAS No.

: 157356-73-5

Mol F.

: C12H18N2O2

Mol W.

: 222.28

Cat No.

: SA17711

Etoricoxib, Impurities

Etoricoxib N1’-Oxide

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In Stock

CAS No.

: 325855-74-1

Mol F.

: C18H15ClN2O3S

Mol W.

: 374.84

Cat No.

: SA41604

Etravirine, Impurities

Etravirine Desamino Impurity

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In Stock

CAS No.

: 269055-04-1

Mol F.

: C20H14BrN5O

Mol W.

: 420.26

Cat No.

: SA26111

Exemestane, Impurities

Exemestane ±β-Spirooxirane 17-keto (Mixture of Diastereomer))

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In Stock

CAS No.

: NA

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19130

Exemestane, Impurities

Exemestane 6-methylsulfonyl; Exemestane impurity 1

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In Stock

CAS No.

: NA

Mol F.

: C21H28O5S

Mol W.

: 392.51

Cat No.

: SA19126

Exemestane, Impurities

Exemestane EP Impurity F

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In Stock

CAS No.

: 72648-46-5

Mol F.

: C₁₉H₂₂O₃

Mol W.

: 298.38

Cat No.

: SA19106

Exemestane, Impurities

Exemestane EP Impurity I

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C21H26O3

Mol W.

: 326.4

Cat No.

: SA19138

Exemestane, Impurities

Exemestane EP Impurity J

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In Stock

CAS No.

: 1160599-91-6

Mol F.

: C22H28O3

Mol W.

: 340.5

Cat No.

: SA19131

Exemestane, Impurities

Exemestane α-Spirooxirane

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In Stock

CAS No.

: 152764-24-4

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19124

Exemestane, Impurities

Exemestane β-Spirooxirane

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In Stock

CAS No.

: 152764-31-3

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19123

Ezetimibe, Impurities

Ezetimibe

Please enquire for price & pack size

In Stock

CAS No.

: 163222-33-1

Mol F.

: C24H21F2NO3

Mol W.

: 409.42

Cat No.

: SA14846

Ezetimibe, Impurities

Ezetimibe -E-Alkene; 3’-Anhydro E Ezetimibe

$300.00 25 mg

In Stock

CAS No.

: 204589-68-4

Mol F.

: C24H19F2NO2

Mol W.

: 391.41

Cat No.

: SA14834

Ezetimibe, Impurities

Ezetimibe -Z-Alkene; 3’-Anhydro Z Ezetimibe

$550.00 25 mg

In Stock

CAS No.

Mol F.

: C24H19F2NO2

Mol W.

: 391.41

Cat No.

: SA14833

Ezetimibe, Impurities

Ezetimibe (3R,4R,3’R)-isomer; RRR-Ezetimibe

$275.00 25 mg

In Stock

CAS No.

: 1593542-96-1

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14809

Ezetimibe, Impurities

Ezetimibe (3R,4R,3’S)-Isomer; SRR-Ezetimibe

$300.00 25 mg

In Stock

CAS No.

: 1478664-02-6

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14822

Ezetimibe, Impurities

Ezetimibe (3S,4S,3’R)-Isomer; RSS-Ezetimibe

$300.00 25 mg

In Stock

CAS No.

: 1478664-18-4

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14821

Ezetimibe, Impurities

Ezetimibe (3S,4S,3’S)-isomer; SSS-Ezetimibe

$275.00 25 mg

In Stock

CAS No.

: 1593543-07-7

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14810

Ezetimibe, Impurities

Ezetimibe Dehydoxy Impurity

$450.00 25 mg

In Stock

CAS No.

: 204589-58-2

Mol F.

: C24H21F2NO2

Mol W.

: 393.44

Cat No.

: SA14828

Ezetimibe, Impurities

Ezetimibe Deprotected Impurity; SRS uncyclized ezetimibe impurity

$200.00 25 mg

In Stock

CAS No.

: 1185883-40-2

Mol F.

: C33H30F2N2O5

Mol W.

: 572.61

Cat No.

: SA14826

Ezetimibe, Impurities

Ezetimibe desfluoro chloro impurity

$350.00 25 mg

In Stock

CAS No.

: 1700622-08-7

Mol F.

: C24H21ClFNO3

Mol W.

: 425.88

Cat No.

: SA14820

Ezetimibe, Impurities

Ezetimibe desfluoro methyl impurity

$350.00 25 mg

In Stock

CAS No.

: 1700622-07-6

Mol F.

: C25H24FNO3

Mol W.

: 405.46

Cat No.

: SA14819

Ezetimibe, Impurities

Ezetimibe Diacetate

$350.00 25 mg

In Stock

CAS No.

: 163380-20-9

Mol F.

: C28H25F2NO5

Mol W.

: 493.5

Cat No.

: SA14807

Ezetimibe, Impurities

Ezetimibe Diol

$395.00 25 mg

In Stock

CAS No.

: 1374250-08-4

Mol F.

: C24H25F2NO3

Mol W.

: 413.47

Cat No.

: SA14815

Ezetimibe, Impurities

Ezetimibe Impurity B; methyl 5-(4-fluorophenyl)-5-oxopentanoate

$150.00 25 mg

In Stock

CAS No.

: 1368310-60-4

Mol F.

: C12H15FO3

Mol W.

: 226.25

Cat No.

: SA14827

Ezetimibe, Impurities

Ezetimibe Ketone

$150.00 25 mg

In Stock

CAS No.

: 191330-56-0

Mol F.

: C24H19F2NO3

Mol W.

: 407.41

Cat No.

: SA14803

Ezetimibe, Impurities

Ezetimibe m-fluoro aniline analog

$200.00 25 mg

In Stock

CAS No.

: 1700622-06-5

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14818

Ezetimibe, Impurities

Ezetimibe resolution mixture

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.42

Cat No.

: SA14854

Ezetimibe, Impurities

Ezetimibe Tetrahydropyran Impurity

$150.00 25 mg

In Stock

CAS No.

: 1296129-15-1; 1050631-82-7

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14801

Ezetimibe, Impurities

Ezetimibe TMS intermediate

$80.00 25 mg

In Stock

CAS No.

: 272778-12-8

Mol F.

: C39H46F2N2O5Si2

Mol W.

: 716.96

Cat No.

: SA14835

Famotidine, Impurities

Famotidine Chloromethyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 81152-53-6

Mol F.

: C5H7ClN4S

Mol W.

: 190.65

Cat No.

: SA40814

Famotidine, Impurities

Famotidine EP Impurity C

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In Stock

CAS No.

: 76824-17-4

Mol F.

: C8H15ClN6O3S3 (HCl salt)

Mol W.

: 374.89

Cat No.

: SA40803

Famotidine, Impurities

Famotidine EP Impurity D

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In Stock

CAS No.

: 76824-16-3

Mol F.

: C8H13N5OS2

Mol W.

: 259.36

Cat No.

: SA40804

Famotidine, Impurities

Famotidine EP Impurity E

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In Stock

CAS No.

: 129083-44-9

Mol F.

: C10H14N8S4

Mol W.

: 374.53

Cat No.

: SA40805

Famotidine, Impurities

Famotidine EP Impurity F

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In Stock

CAS No.

: 107880-74-0

Mol F.

: C8H12N4O2S2

Mol W.

: 260.34

Cat No.

: SA40806

Famotidine, Impurities

Famotidine EP Impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 1020719-36-1

Mol F.

: CˆH„N†O„Sƒ

Mol W.

: 354.43

Cat No.

: SA40808

Famotidine, Impurities

Famotidine EP Impurity J

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In Stock

CAS No.

: 76824-14-1(free base); 1798006-30-0

Mol F.

: C9H14N4O2S2

Mol W.

: 274.37

Cat No.

: SA40810

Famotidine, Impurities

Famotidine Isothiourea Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 88046-01-9; 106649-96-1 (Free Base)

Mol F.

: C6H10N6S2

Mol W.

: 230.32

Cat No.

: SA40813

Famotidine, Impurities

Famotidine Sulfoxide

Please enquire for price & pack size

In Stock

CAS No.

: 90237-03-9

Mol F.

: CˆH…N‡OƒSƒ

Mol W.

: 353.44

Cat No.

: SA40809