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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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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.

: 3093141-55-7

Mol F.

: C23H29ClO6

Mol W.

: 436.93

Cat No.

: SA15032

Apixaban

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

$90.00 25 mg

In Stock

CAS No.

: 1644619-42-0

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

Please enquire for price & pack size

In Stock

CAS No.

: 325855-74-1

Mol F.

: C18H15ClN2O3S

Mol W.

: 374.84

Cat No.

: SA41604

Etravirine, Impurities

Etravirine Desamino Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 269055-04-1

Mol F.

: C20H14BrN5O

Mol W.

: 420.26

Cat No.

: SA26111

Exemestane, Impurities

Exemestane 6-methylsulfonyl; Exemestane impurity 1

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C21H28O5S

Mol W.

: 392.51

Cat No.

: SA19126

Exemestane, Impurities

Exemestane EP Impurity F

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 1160599-91-6

Mol F.

: C22H28O3

Mol W.

: 340.5

Cat No.

: SA19131

Exemestane, Impurities

Exemestane Related Compound 2

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19107

Exemestane, Impurities

Exemestane α-Spirooxirane

Please enquire for price & pack size

In Stock

CAS No.

: 152764-24-4

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.40

Cat No.

: SA19124

Exemestane

Exemestane αβ-Spirooxirane 17-keto (Mixture of Diastereomer)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19130

Exemestane, Impurities

Exemestane β-Spirooxirane

Please enquire for price & pack size

In Stock

CAS No.

: 152764-31-3

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.4

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

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

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

$175.00 10 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

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

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.

: NA

Mol F.

: C24H21F2NO3

Mol W.

: 409.42

Cat No.

: SA14854

Ezetimibe

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

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 76824-16-3

Mol F.

: C8H13N5OS2

Mol W.

: 259.36

Cat No.

: SA40804

Famotidine, Impurities

Famotidine EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 129083-44-9

Mol F.

: C10H14N8S4

Mol W.

: 374.53

Cat No.

: SA40805

Famotidine

Famotidine EP Impurity F

Please enquire for price & pack size

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.

: C8H14N6O4S3 : HCl

Mol W.

: 354.43

Cat No.

: SA40808

Famotidine, Impurities

Famotidine EP Impurity J

Please enquire for price & pack size

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.

: C8H15N7O3S3

Mol W.

: 353.44

Cat No.

: SA40809

Febuxostat, Impurities

Febuxostat

Please enquire for price & pack size

In Stock

CAS No.

: 144060-53-7

Mol F.

: C16H16N2O3S

Mol W.

: 316.37

Cat No.

: SA32000

Febuxostat, Impurities

Febuxostat 2-Butyl Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 1335202-59-9

Mol F.

: C16H16N2O3S

Mol W.

: 316.37

Cat No.

: SA32002

Febuxostat, Impurities

Febuxostat Amide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1239233-86-3

Mol F.

: C16H18N2O4S

Mol W.

: 334.39

Cat No.

: SA32010

Febuxostat, Impurities

Febuxostat Ethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 160844-75-7

Mol F.

: C18H20N2O3S

Mol W.

: 344.43

Cat No.

: SA32019

Febuxostat, Impurities

Febuxostat Isopropyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 1346238-10-5

Mol F.

: C19H22N2O3S

Mol W.

: 358.45

Cat No.

: SA32005

Febuxostat, Impurities

Febuxostat Isopropyl Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 144060-52-6

Mol F.

: C15H14N2O3S

Mol W.

: 302.35

Cat No.

: SA32001

Febuxostat

Febuxostat n-Butyl Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 1657014-33-9

Mol F.

: C16H16N2O3S

Mol W.

: 316.37

Cat No.

: SA32006