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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, Roflumilast

Roflumilast Dihydroxy Impurity

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CAS No.

: 1412448-29-3

Mol F.

: C12H8Cl2N2O3

Mol W.

: 299.11

Cat No.

: SA38103

Impurities, Roflumilast

Roflumilast N-Oxide

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CAS No.

: 292135-78-5

Mol F.

: C17H14Cl2F2N2O4

Mol W.

: 419.2

Cat No.

: SA38104

Impurities, Roflumilast

Roflumilast Related Compound C (USP)

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CAS No.

: 22889-78-7

Mol F.

: C5H4Cl2N2

Mol W.

: 163.00

Cat No.

: SA38109

Impurities, Roflumilast

Roflumilast Related Compound E (USP)

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CAS No.

: 3031785-18-6

Mol F.

: C17H14BrClF2N2O3

Mol W.

: 447.66

Cat No.

: SA38108

Impurities, Ropinirole

Ropinirole

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CAS No.

: 91374-21-9

Mol F.

: C16H25ClN2O

Mol W.

: 296.84

Cat No.

: SA41200

Impurities, Ropinirole

Ropinirole 3-Methoxy Impurity

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CAS No.

: 1797131-21-5

Mol F.

: C17H27ClN2O2

Mol W.

: 326.86

Cat No.

: SA41216

Impurities, Ropinirole

Ropinirole Aminoacetic Acid

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CAS No.

: 920755-10-8

Mol F.

: C16H25N2NaO2

Mol W.

: 278.39

Cat No.

: SA41212

Impurities, Ropinirole

Ropinirole Bromoethyl Impurity

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CAS No.

: 120427-96-5

Mol F.

: C10H10BrNO

Mol W.

: 240.1

Cat No.

: SA41213

Impurities, Ropinirole

Ropinirole EP Impurity A

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CAS No.

: 221264-21-7 (HCl salt)

Mol F.

: C16H23ClN2O2

Mol W.

: 310.82

Cat No.

: SA41201

Impurities, Ropinirole

Ropinirole EP Impurity B

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CAS No.

: 249622-60-4

Mol F.

: C16H24N2O

Mol W.

: 260.37

Cat No.

: SA41202

Impurities, Ropinirole

Ropinirole EP Impurity C

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CAS No.

: 221264-43-3 (Z/E); 145570-92-9 (Z)

Mol F.

: C19H29ClN2O

Mol W.

: 336.9

Cat No.

: SA41203

Impurities, Ropinirole

Ropinirole EP Impurity D

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CAS No.

: 173990-76-6

Mol F.

: C13H18N2O.HCl

Mol W.

: 254.76

Cat No.

: SA41204

Impurities, Ropinirole

Ropinirole EP Impurity E

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CAS No.

Mol F.

: C17H24N2O

Mol W.

: 272.39

Cat No.

: SA41205

Impurities, Ropinirole

Ropinirole EP Impurity F

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CAS No.

: 139122-19-3

Mol F.

: C10H11NO2

Mol W.

: 177.2

Cat No.

: SA41206

Impurities, Ropinirole

Ropinirole EP Impurity G

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CAS No.

: 76149-15-0

Mol F.

: C16H24N2

Mol W.

: 244.38

Cat No.

: SA41207

Impurities, Ropinirole

Ropinirole EP Impurity H

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CAS No.

Mol F.

: C16H23N3O2

Mol W.

: 289.37

Cat No.

: SA41208

Impurities, Ropinirole

Ropinirole N-Ethyl Impurity

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CAS No.

: 1797132-03-6

Mol F.

: C18H28N2O

Mol W.

: 288.43

Cat No.

: SA41209

Impurities, Ropinirole

Ropinirole N-Hydroxy Impurity

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CAS No.

: 954117-22-7 (base)

Mol F.

: C16H25ClN2O2

Mol W.

: 312.83

Cat No.

: SA41215

Impurities, Ropinirole

Ropinirole N-Hydroxymethyl Impurity

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CAS No.

: 1027600-42-5

Mol F.

: C17H26N2O2

Mol W.

: 290.4

Cat No.

: SA41210

Impurities, Ropinirole

Ropinirole N-Oxide

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CAS No.

: 1076199-41-1 (base)

Mol F.

: C16H25ClN2O2 (HCl salt)

Mol W.

: 312.83

Cat No.

: SA41214

Impurities, Ropinirole

Ropinirole Open Ring Nitro Impurity

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CAS No.

: 91374-25-3

Mol F.

: C16H25ClN2O4

Mol W.

: 344.83

Cat No.

: SA41211

Impurities, Rosuvastatin

Rosuvastatin (3R,5R)-Isomer Ethyl Ester

$1,050.00 25 mg

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CAS No.

Mol F.

: C24H32FN3O6S

Mol W.

: 509.59

Cat No.

: SA12172

Impurities, Rosuvastatin

Rosuvastatin (3R,5R)-Lactone

$555.00 25 mg

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CAS No.

: 1422954-11-7

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA12173

Impurities, Rosuvastatin

Rosuvastatin (3S,5R)-Isomer Ethyl Ester

$650.00 25 mg

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CAS No.

: 615263-55-3

Mol F.

: C24H32FN3O6S

Mol W.

: 509.59

Cat No.

: SA12174

Impurities, Rosuvastatin

Rosuvastatin (3S,5R)-Isomer Methyl Ester

$600.00 25 mg

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CAS No.

: 615263-54-2

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA12175

Impurities, Rosuvastatin

Rosuvastatin (3S,5S)-Isomer Ethyl Ester

$1,195.00 50 mg

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CAS No.

Mol F.

: C24H32FN3O6S

Mol W.

: 509.59

Cat No.

: SA12176

Impurities, Rosuvastatin

Rosuvastatin (3S,5S)-Isomer Methyl Ester

$1,195.00 50 mg

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA12177

Rosuvastatin

Rosuvastatin (3S,5S)-Isomer Methyl Ester

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA121106

Impurities, Rosuvastatin

Rosuvastatin (3S,5S)-Isomer Methyl Ester

$755.00 100 mg

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA121105

Impurities, Rosuvastatin

Rosuvastatin (3S,5S)-Isomer t-Butyl Ester

$1,150.00 25 mg

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CAS No.

: 2185805-16-5

Mol F.

: C26H36FN3O6S

Mol W.

: 537.64

Cat No.

: SA12171

Impurities, Rosuvastatin

Rosuvastatin (6R)-Anhydro Lactone Impurity

$650.00 25 mg

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CAS No.

: 2514682-15-4

Mol F.

: C22H24FN3O4S

Mol W.

: 445.51

Cat No.

: SA12169

Impurities, Rosuvastatin

Rosuvastatin (6R)-Isomer Methyl Ester

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA12179

Impurities, Rosuvastatin

Rosuvastatin (6R)-Isomer Methyl Ester

$1,550.00 100 mg

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA121107

Impurities, Rosuvastatin

Rosuvastatin (6S)-Anhydro Lactone Impurity

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CAS No.

: 2514963-93-8

Mol F.

: C22H24FN3O4S

Mol W.

: 445.51

Cat No.

: SA12181

Impurities, Rosuvastatin

Rosuvastatin (6S)-Isomer Methyl Ester

$1,549.00 100 mg

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CAS No.

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA121108

Impurities, Rosuvastatin

Rosuvastatin 2-fluorophenyl Impurity

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CAS No.

: NA

Mol F.

: C22H28FN3O6S

Mol W.

: 481.54

Cat No.

: SA121138

Impurities, Rosuvastatin

Rosuvastatin 2,3-Anhydro Acid Ethyl Ester

$455.00 50 mg

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CAS No.

: 2452383-23-0

Mol F.

: C24H30FN3O5S

Mol W.

: 491.59

Cat No.

: SA12184

Impurities, Rosuvastatin

Rosuvastatin 2,3,4,5-Dianhydro Acid Ethyl Ester

$1,995.00 100 mg

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CAS No.

Mol F.

: C24H28FN3O4S

Mol W.

: 473.17

Cat No.

: SA12183

Impurities, Rosuvastatin

Rosuvastatin 3-fluorophenyl Impurity

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CAS No.

: NA

Mol F.

: C22H28FN3O6S

Mol W.

: 481.54

Cat No.

: SA121139

Impurities, Rosuvastatin

Rosuvastatin 3-Oxo Acid Ethyl Ester

$1,195.00 50 mg

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CAS No.

: 901765-36-4

Mol F.

: C24H30FN3O6S

Mol W.

: 507.57

Cat No.

: SA12185

Impurities, Rosuvastatin

Rosuvastatin 3-Oxo Acid Sodium Salt

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CAS No.

: 1346747-49-6

Mol F.

: C22H25FN3NaO6S

Mol W.

: 501.51

Cat No.

: SA12146

Impurities, Rosuvastatin

Rosuvastatin 4,5-Anhydro Acid Calcium Salt

$1,550.00 25 mg

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CAS No.

: 1346606-44-7(Acid)

Mol F.

: C22H25FN3O5S.1/2Ca

Mol W.

: 482.51

Cat No.

: SA12124

Impurities, Rosuvastatin

Rosuvastatin 5-Oxo Acid Ethyl Ester

$455.00 50 mg

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CAS No.

: 1863898-67-2

Mol F.

: C24H30FN3O6OS

Mol W.

: 507.57

Cat No.

: SA12186

Impurities, Rosuvastatin

Rosuvastatin acetonide N,N’-dimethy amide

$450.00 25 mg

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CAS No.

Mol F.

: C27H37FN4O5S

Mol W.

: 548.67

Cat No.

: SA12199

Impurities, Rosuvastatin

Rosuvastatin Allyl Ester

$150.00 25 mg

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CAS No.

: 1352945-05-1

Mol F.

: C25H32FN3O6S

Mol W.

: 521.6

Cat No.

: SA12114

Impurities, Rosuvastatin

Rosuvastatin Calcium Salt

$100.00 25 mg

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CAS No.

: 147098-20-2

Mol F.

: C22H27FN3O6S.1/2Ca

Mol W.

: 500.57

Cat No.

: SA12113

Impurities, Rosuvastatin

Rosuvastatin Chloro 3-oxohexanoic Acid Impurity

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CAS No.

: 587855-03-6

Mol F.

: C6H9ClO4

Mol W.

: 180.6

Cat No.

: SA121136

Impurities, Rosuvastatin

Rosuvastatin Chloro-3,5-dihydroxyhexanoic Acid Impurity

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CAS No.

: 958358-67-3

Mol F.

: C6H11ClO4

Mol W.

: 182.6

Cat No.

: SA121137

Impurities, Rosuvastatin

Rosuvastatin D-5 Diastereomer Impurity

$200.00 25 mg

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CAS No.

: 1025085-36-2

Mol F.

: C15H26O6

Mol W.

: 302.36

Cat No.

: SA121104

Rosuvastatin

Rosuvastatin Desfluoride Impurity (RRT 0.87)

$555.00 1 g

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CAS No.

: 868755-01-5

Mol F.

: C15H18N2O3

Mol W.

: 274.32

Cat No.

: SA121135