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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, 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

Impurities, 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 2,3-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-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.

: C22H26FN3NaO6S

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 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

Impurities, 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

Impurities, Rosuvastatin

Rosuvastatin EP Impurity A T-Butyl Ester

$450.00 25 mg

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CAS No.

: 1714147-49-5

Mol F.

: C29H42FN3O7S

Mol W.

: 595.72

Cat No.

: SA12137

Impurities, Rosuvastatin

Rosuvastatin EP Impurity N

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CAS No.

: 2290571-51-4

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA121117

Impurities, Rosuvastatin

Rosuvastatin Impurity SA12159

$350.00 25 mg

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CAS No.

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA12159

Impurities, Rosuvastatin

Rosuvastatin impurity-9

$995.00 500 mg

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CAS No.

: 2095786-11-9

Mol F.

: C13H22O6

Mol W.

: 274.31

Cat No.

: SA121109

Impurities, Rosuvastatin

Rosuvastatin Sodium (3S,5S)-Isomer

$950.00 25 mg

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CAS No.

Mol F.

: C22H27FN3NaO6S

Mol W.

: 503.52

Cat No.

: SA12178

Impurities, Rosuvastatin

Rosuvastatin tert-Butyl Ester

$750.00 25 mg

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CAS No.

: 1283766-30-2

Mol F.

: C24H34FN3O6S

Mol W.

: 523.62

Cat No.

: SA12120

Impurities, Rosuvastatin

Rosuvastatin Triphenylphosphonium Bromide

$80.00 25 mg

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CAS No.

: 885477-83-8

Mol F.

: C34H34BrFN3O2PS

Mol W.

: 678.59

Cat No.

: SA12118

Edoxaban, Impurities

RSR Boc-Cyclohexyl Diastereomer of Edoxaban

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CAS No.

: 2081883-57-8

Mol F.

: C14H27N3O3

Mol W.

: 285.39

Cat No.

: SA33020

Edoxaban, Impurities

RSS-Edoxaban

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CAS No.

: 1255529-25-9

Mol F.

: C24H32ClN7O4S

Mol W.

: 550.07

Cat No.

: SA33005

Impurities, Nitrosamine, Ruxolitinib

Ruxolitinib 4-chloro-7-nitroso Pyrrolo Pyrimidine Impurity

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CAS No.

: NA

Mol F.

: C6H3ClN4O

Mol W.

: 182.57

Cat No.

: SA43407

Impurities, Nitrosamine, Ruxolitinib

Ruxolitinib Dinitroso Pyrrolo Pyrimidine Impurity

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CAS No.

: NA

Mol F.

: C9H5N7O2

Mol W.

: 243.18

Cat No.

: SA43406

Impurities, Ruxolitinib

Ruxolitinib M18 metabolite impurity

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CAS No.

: 1315607-85-2

Mol F.

: C17H18N6O

Mol W.

: 322.36

Cat No.

: SA43404

Impurities, Nitrosamine, Ruxolitinib

Ruxolitinib N-Nitroso Pyrazole Boronate Ester

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CAS No.

: NA

Mol F.

: C9H14BN3O3

Mol W.

Cat No.

: SA43408

Impurities, Nitrosamine, Ruxolitinib

Ruxolitinib N-Nitroso Trimethylsilyl Ethoxy Impurity

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CAS No.

: NA

Mol F.

: C15H20N6O2Si

Mol W.

: 344.44

Cat No.

: SA43405

Impurities, Ruxolitinib

Ruxolitinib N-oxide 1

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CAS No.

Mol F.

: C17H18N6O

Mol W.

: 322.37

Cat No.

: SA43401

Impurities, Ruxolitinib

Ruxolitinib N-oxide 2

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CAS No.

Mol F.

: C17H18N6O

Mol W.

: 322.37

Cat No.

: SA43402

Impurities, Nicotine

S-(-)-Nicotine Ditartrate Dihydrate

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CAS No.

: 6019-06-3

Mol F.

: C₁₀H₁₄N₂•2(C₄H₆O₆)•2(H₂O)

Mol W.

: 498.44

Cat No.

: SA32208

Impurities, Manidipine

S-(+)-Manidipine

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CAS No.

: 126451-47-6

Mol F.

: C₃₅H₃₈N₄O₆

Mol W.

: 610.7

Cat No.

: SA29803

Fulvestrant, Impurities

S-Deoxo ∆6-Fulvestrant; Delta (6,7) Deoxo Fulvestrant Impurity

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CAS No.

: 2170200-16-3

Mol F.

: C32H45F5O2S

Mol W.

: 588.76

Cat No.

: SA11806

Fulvestrant, Impurities

S-Deoxo-3,17β-bis-(O-tetrahydro-2H-pyran-2-yl)-6-oxo-fulvestrant

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CAS No.

: 862700-70-7

Mol F.

: C42H61F5O5S

Mol W.

: 772.99

Cat No.

: SA11808