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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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Ertugliflozin, Impurities

Ertugliflozin Hydroxy Impurity

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In Stock

CAS No.

: 1298086-28-8

Mol F.

: C22H25ClO8

Mol W.

: 452.88200000000001

Cat No.

: SA36806

Ertugliflozin, Impurities

Ertugliflozin Keto Impurity

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In Stock

CAS No.

: 1298086-37-9

Mol F.

: C22H23ClO8

Mol W.

: 450.86

Cat No.

: SA36807

Ertugliflozin, Impurities

Ertugliflozin Tetraacetate Impurity

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In Stock

CAS No.

: 1298086-18-6

Mol F.

: C30H33ClO11

Mol W.

: 605.03

Cat No.

: SA36809

Escitalopram, Impurities

Escitalopram EP Impurity H

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In Stock

CAS No.

: 63284-72-0(base);62498-71-9(HClsalt)

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA21208

Escitalopram, Impurities

Escitalopram EP Impurity I

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In Stock

CAS No.

: 1370643-22-3(base)

Mol F.

: C20H21FN2O

Mol W.

: 324.39

Cat No.

: SA21209

Esculin, Impurities

Esculin

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In Stock

CAS No.

: 531-75-9

Mol F.

: C15H16O9

Mol W.

: 340.28

Cat No.

: SA48100

Eslicarbazepine, Impurities

Eslicarbazepine (R) Acetate

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In Stock

CAS No.

: 186694-45-1

Mol F.

: C17H16N2O3

Mol W.

: 296.32

Cat No.

: SA28806

Carbamazepine, Impurities

Eslicarbazepine Acetate

$95.00 25 mg

In Stock

CAS No.

: 236395-14-5

Mol F.

: C1H16N2O3

Mol W.

: 296.32

Cat No.

: SA20339

Eslicarbazepine, Impurities

Eslicarbazepine Dehydro Impurity

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In Stock

CAS No.

: 952740-00-0

Mol F.

: C17H14N2O3

Mol W.

: 294.3

Cat No.

: SA28807

Estradiol hemihydrate, Impurities

Estradiol hemihydrate EP Impurity A

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In Stock

CAS No.

: 53-16-7

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA14301

Estradiol hemihydrate, Impurities

Estradiol hemihydrate EP Impurity B

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In Stock

CAS No.

: 57-91-0

Mol F.

: C₁₈H₂₄O₂

Mol W.

: 272.38

Cat No.

: SA14302

Estradiol hemihydrate, Impurities

Estradiol hemihydrate EP Impurity C

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In Stock

CAS No.

: 6171-48-8

Mol F.

: C₁₉H₂₆O₂

Mol W.

: 286.41

Cat No.

: SA14303

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity F

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In Stock

CAS No.

: 18069-79-9

Mol F.

: C22H30O3

Mol W.

: 342.47

Cat No.

: SA14006

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity H

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In Stock

CAS No.

: 1421283-56-8

Mol F.

: C28H40O4

Mol W.

: 440.61

Cat No.

: SA14008

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity J

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In Stock

CAS No.

Mol F.

: C24H34O3

Mol W.

: 370.52

Cat No.

: SA14010

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity A

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In Stock

CAS No.

: 4717-38-8

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA13107

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity B

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In Stock

CAS No.

: 1231-96-5

Mol F.

: C20H22O2

Mol W.

: 294.39

Cat No.

: SA13101

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity E

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In Stock

CAS No.

: 27521-34-2

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA13102

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.

: 515.42

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

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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 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

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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.

: 312.4

Cat No.

: SA19123

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

$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, 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