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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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Eplerenone, Impurities

Eplerenone EP Impurity B

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CAS No.

: 192704-82-8

Mol F.

: C24H30O6

Mol W.

: 414.49

Cat No.

: SA41805

Eplerenone, Impurities

Eplerenone EP Impurity C

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CAS No.

: 95716-70-4

Mol F.

: C24H30O5

Mol W.

: 398.49

Cat No.

: SA41812

Eplerenone, Impurities

Eplerenone EP Impurity D

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CAS No.

: 209253-82-7

Mol F.

: C23H28O6

Mol W.

: 400.46

Cat No.

: SA41806

Eplerenone, Impurities

Eplerenone EP Impurity E

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CAS No.

: 209253-81-6

Mol F.

: C24H30O6

Mol W.

: 414.49

Cat No.

: SA41811

Eplerenone, Impurities

Eplerenone EP Impurity F

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CAS No.

: 579484-30-3

Mol F.

: C24H32O7

Mol W.

: 432.51

Cat No.

: SA41807

Eplerenone, Impurities

Eplerenone EP Impurity G

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CAS No.

: 41020-65-9

Mol F.

: C24H32O5

Mol W.

: 400.51

Cat No.

: SA41808

Fluorometholone, Impurities

Epoxyfluorometholone acetate

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CAS No.

: 83873-17-0

Mol F.

: C24H30O5

Mol W.

: 398.49

Cat No.

: SA38417

Equilin, Impurities

Equilin

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CAS No.

: 474-86-2

Mol F.

: C18H20O2

Mol W.

: 268.35

Cat No.

: SA16400

Equilin, Impurities

Equilin 3-Benzoate

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CAS No.

: 6030-80-4

Mol F.

: C25H24O3

Mol W.

: 372.45

Cat No.

: SA16401

Equilin, Impurities

Equilin 3-O-Methyl Ether

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CAS No.

: 6030-83-7

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA16407

Erlotinib, Impurities

Erlotinib 7-O-Chloroethyl Analog

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CAS No.

: 183320-19-6

Mol F.

: C21H21Cl2N3O3

Mol W.

: 434.32

Cat No.

: SA25204

Erlotinib, Impurities

Erlotinib Carboxylic Acid

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CAS No.

: 882420-21-5

Mol F.

: C22H25N3O6

Mol W.

: 427.45

Cat No.

: SA25206

Erlotinib, Impurities

Erlotinib Didesmethyl

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CAS No.

: 183321-84-8(base)183320-12-9(HClsalt)

Mol F.

: C20H19N3O4

Mol W.

: 365.38

Cat No.

: SA25208

Erlotinib, Impurities

Erlotinib Impurity E

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CAS No.

: 1058132-82-3

Mol F.

: C22H25N3O4

Mol W.

: 395.45

Cat No.

: SA25215

Erlotinib, Impurities

Erlotinib Impurity F

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CAS No.

: 1809951-10-7

Mol F.

: C28H34N4O9

Mol W.

: 570.59

Cat No.

: SA25223

Erlotinib, Impurities

Erlotinib Impurity K

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CAS No.

: 2204518-92-1

Mol F.

: C22H24ClN3O4

Mol W.

: 429.9

Cat No.

: SA25219

Erlotinib, Impurities

Erlotinib Related compound A

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CAS No.

: 299912-59-7

Mol F.

: C25H30ClN3O5

Mol W.

: 487.98

Cat No.

: SA25214

Ertugliflozin, Impurities

Ertugliflozin

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CAS No.

: 1210344-57-2

Mol F.

: C22H25ClO7

Mol W.

: 436.88

Cat No.

: SA36800

Ertugliflozin, Impurities

Ertugliflozin C-2 Epimer Impurity

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CAS No.

Mol F.

: C22H25ClO7

Mol W.

: 436.88

Cat No.

: SA36805

Ertugliflozin, Impurities

Ertugliflozin Impuity SA36802

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CAS No.

Mol F.

: C28H33ClO13

Mol W.

: 613

Cat No.

: SA36802

Ertugliflozin, Impurities

Ertugliflozin isomer Impurity

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CAS No.

Mol F.

: C22H25ClO7

Mol W.

: 436.88

Cat No.

: SA36801

Escitalopram, Impurities

Escitalopram acid

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CAS No.

Mol F.

: C20H21FN2O3

Mol W.

: 356.39

Cat No.

: SA21214

Escitalopram, Impurities

Escitalopram EP Impurity A

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CAS No.

: 64372-56-1

Mol F.

: C20H23FN2O2

Mol W.

: 342.41

Cat No.

: SA21201

Escitalopram, Impurities

Escitalopram EP Impurity B

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CAS No.

: 411221-53-9(base);1332724-03-4(oxalatesalt)

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA21202

Escitalopram, Impurities

Escitalopram EP Impurity C

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CAS No.

: 372941-54-3(base)

Mol F.

: C20H19FN2O2

Mol W.

: 338.37

Cat No.

: SA21203

Escitalopram, Impurities

Escitalopram EP Impurity D

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CAS No.

: 144025-14-9(HClsalt);1188264-72-3(HBrsalt)

Mol F.

: C19H20ClFN2O

Mol W.

: 346.83

Cat No.

: SA21204

Escitalopram, Impurities

Escitalopram EP Impurity E

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CAS No.

: 103146-25-4(base);103146-26-5(HBrsalt)

Mol F.

: C20H23FN2O2

Mol W.

: 342.41

Cat No.

: SA21205

Escitalopram, Impurities

Escitalopram EP Impurity F

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CAS No.

: 2102609-59-4

Mol F.

: C14H18N2O2

Mol W.

: 246.3

Cat No.

: SA21206

Escitalopram, Impurities

Escitalopram EP Impurity G

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CAS No.

: 1329745-98-3(base)

Mol F.

: C25H35FN2O2

Mol W.

: 412.54

Cat No.

: SA21207

Escitalopram, Impurities

Escitalopram EP Impurity K

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CAS No.

: 128196-02-1(base);219861-53-7(oxalatesalt)

Mol F.

: C20H21FN2O

Mol W.

: 324.39

Cat No.

: SA21210

Escitalopram, Impurities

Escitalopram EP Impurity L

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CAS No.

: 1346617-30-8

Mol F.

: C20H22N2O

Mol W.

: 306.39999999999998

Cat No.

: SA21211

Escitalopram, Impurities

Escitalopram EP Impurity M

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CAS No.

: 440121-09-5

Mol F.

: C20H22FNO3

Mol W.

: 343.39

Cat No.

: SA21212

Escitalopram, Impurities

Escitalopram Oxalate

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CAS No.

: 219861-08-2(OxalataSalt);128196-01-0(Base)

Mol F.

: C22H23FN2O5

Mol W.

: 414.43

Cat No.

: SA21213

Eslicarbazepine, Impurities

Eslicarbazepine Acetate

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CAS No.

: 236395-14-5

Mol F.

: C17H16N2O3

Mol W.

: 296.32

Cat No.

: SA28801

Eslicarbazepine, Impurities

Eslicarbazepine Acetate Nitroso Impurity

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CAS No.

Mol F.

: C16H14N2O3

Mol W.

: 282.3

Cat No.

: SA28809

Estrone, Impurities

Estra-5(10),9(11)-diene-3,17-dione-3-ethylene Ketal

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CAS No.

: 5571-36-8

Mol F.

: C20H26O3

Mol W.

: C20H26O3

Cat No.

: SA16011

Estradiol, Impurities

Estradiol 3,17-Divalerate; Estradiol Valerate Impurity E

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CAS No.

: 63042-28-4

Mol F.

: C28H40O4

Mol W.

: 440.61

Cat No.

: SA13214

Estradiol Valerate, Impurities

Estradiol Divalerate 6-Keto Impurity

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CAS No.

: 1350468-78-8

Mol F.

: C28H38O5

Mol W.

: 454.6

Cat No.

: SA14012

Estradiol Valerate, Impurities

Estradiol Divalerate 6a-Hydroxy Impurity

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CAS No.

: 1350468-75-5

Mol F.

: C28H40O5

Mol W.

: 456.61

Cat No.

: SA14013

Estradiol hemihydrate, Impurities

Estradiol hemihydrate EP Impurity D

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CAS No.

: 791-69-5

Mol F.

: C18H22O2

Mol W.

: 270.67

Cat No.

: SA14304

Estradiol Valerate, Impurities

Estradiol Valerate

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CAS No.

: 979-32-8

Mol F.

: C23H32O3

Mol W.

: 356.5

Cat No.

: SA14018

Estradiol Valerate, Impurities

Estradiol Valerate 6-Keto Impurity

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CAS No.

: 1313382-51-2

Mol F.

: C23H30O4

Mol W.

: 370.48

Cat No.

: SA14017

Estradiol Valerate, Impurities

Estradiol Valerate 6α-Hydroxy Impurity

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CAS No.

: 1313382-26-1

Mol F.

: C23H32O4

Mol W.

: 372.5

Cat No.

: SA14015

Estradiol Valerate, Impurities

Estradiol Valerate 6β-Hydroxy Impurity

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CAS No.

: 1313382-32-9

Mol F.

: C23H32O4

Mol W.

: 372.5

Cat No.

: SA14016

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity A

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CAS No.

: 50-28-2

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA14001

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity B

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CAS No.

: 21881-45-8

Mol F.

: C23H32O3

Mol W.

: 356.5

Cat No.

: SA14002

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity C

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CAS No.

: 95959-20-9

Mol F.

: C23H30O3

Mol W.

: 354.48

Cat No.

: SA14003

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity D

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CAS No.

: 1359847-37-2

Mol F.

: C24H34O3

Mol W.

: 370.52

Cat No.

: SA14004

Estradiol Valerate, Impurities

Estradiol Valerate EP Impurity E

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CAS No.

: 63042-28-4

Mol F.

: C28H40O4

Mol W.

: 440.61

Cat No.

: SA14005

Estradiol Valerate, Impurities

Estradiol valerate EP Impurity G

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CAS No.

: 1313382-25-0

Mol F.

: C23H30O3

Mol W.

: 354.48

Cat No.

: SA14007