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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, Terbutaline

Terbutaline EP Impurity D

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CAS No.

: 1797117-23-7

Mol F.

: C19H23NO3

Mol W.

: 313.39

Cat No.

: SA29004

Edoxaban, Impurities

Tert-butyl ((1S,2R,5R)-2-amino-5-(dimethylcarbamoyl)cyclohexyl)carbamate oxalate

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CAS No.

: 2605225-72-5

Mol F.

: C16H29N3O7

Mol W.

: 375.42

Cat No.

: SA33039

Edoxaban, Impurities

Tert-butyl (1R,2S,5R)-2-(3-(5- chloropyridin-2-yl)-2- oxopropanamido)-5- (dimethylcarbamoyl)cyclohexy lcarbamate

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CAS No.

Mol F.

: C21H30ClN5O5

Mol W.

: 467.95

Cat No.

: SA33046

Edoxaban, Impurities

Tert-butyl (1S,2R,5S)-2-(2-(5- chloropyridin-2-ylamino)-2- oxoacetamido)-5- (dimethylcarbamoyl)cyclohexy lcarbamate

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CAS No.

: 2024614-15-9

Mol F.

: C21H30ClN5O5

Mol W.

: 467.95

Cat No.

: SA33044

Impurities, Palbociclib

Tert-butyl (6-aminopyridin-3-yl)(2-((tert-butoxycarbonyl)amino)ethyl)carbamate

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CAS No.

: NA

Mol F.

: C17H28N4O4

Mol W.

: 352.4

Cat No.

: SA40421

Impurities, Palbociclib

Tert-butyl (6-aminopyridin-3-yl)(2-(bis(tert-butoxycarbonyl)amino)ethyl)carbamate

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CAS No.

: NA

Mol F.

: C22H36N4O6

Mol W.

: 452.6

Cat No.

: SA40422

Impurities, Rosuvastatin

tert-butyl 2-((4R,6R)-2,2-dimethyl-6-((5-methyl-1,3,4-thiadiazol-2-ylsulfonyl)methyl)-1,3-dioxan-4-yl)acetate

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CAS No.

Mol F.

: C16H26N2O6S2

Mol W.

: 406.52

Cat No.

: SA121127

Impurities, Rosuvastatin

tert-butyl 2-((4R,6S)-2,2-dimethyl-6-(((R)-5-methyl-1,3,4-thiadiazol-2-ylsulfinyl)methyl)-1,3-dioxan-4-yl)acetate

$1,400.00 50 mg

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CAS No.

Mol F.

: C16H26N2O5S2

Mol W.

: 390.52

Cat No.

: SA121132

Impurities, Rosuvastatin

tert-butyl 2-((4R,6S)-2,2-dimethyl-6-(((S)-5-methyl-1,3,4-thiadiazol-2-ylsulfinyl)methyl)-1,3-dioxan-4-yl)acetate

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CAS No.

Mol F.

: C16H26N2O5S2

Mol W.

: 390.52

Cat No.

: SA121133

Impurities, Rosuvastatin

tert-butyl 2-((4R,6S)-6-((E)-2-(4-(4-fluorophenyl)-2-((E)-2-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)-N-methylvinylsulfonamido)-6-isopropylpyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate

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CAS No.

Mol F.

: C45H56F2N6O8S2

Mol W.

: 911.09

Cat No.

: SA121124

Impurities, Rosuvastatin

tert-butyl 2-((4R,6S)-6-((E)-2-(4-(4-fluorophenyl)-2-(2-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethyl sulfonamido)pyrimidin-5-yl)-2-hydroxy-N-methyl ethyl sulfonamido)-6-isopropylpyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl) acetate

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CAS No.

Mol F.

: C45H58F2N6O9S2

Mol W.

: 929.10

Cat No.

: SA121125

Atorvastatin, Impurities

tert-butyl 2-((4R,6S)-6-(2-aminoethyl)-2,2-dimethyl-1,3-dooxan-4-yl)acetate

$500.00 100 mg

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CAS No.

: 2088732-01-6

Mol F.

: C14H27NO4

Mol W.

: 273.19

Cat No.

: SA17838

Impurities, Rosuvastatin

tert-butyl 2-((4S,6R)-2,2-dimethyl-6-((5-methyl-1,3,4-thiadiazol-2-ylsulfonyl)methyl)-1,3-dioxan-4-yl)acetate

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CAS No.

Mol F.

: C16H26N2O6S2

Mol W.

: 406.52

Cat No.

: SA121131

Impurities, Rosuvastatin

tert-butyl 2-((4S,6S)-2,2-dimethyl-6-((5-methyl-1,3,4-thiadiazol-2-ylsulfonyl)methyl)-1,3-dioxan-4-yl)acetate

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CAS No.

Mol F.

: C16H26N2O6S2

Mol W.

: 406.52

Cat No.

: SA121128

Impurities, Palbociclib

Tert-butyl 2-(6-aminopyridin-3-ylamino)ethylcarbamate

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CAS No.

: 1367858-24-9

Mol F.

: C12H20N4O2

Mol W.

: 252.3

Cat No.

: SA40420

Impurities, Palbociclib

tert-Butyl 4-(2-nitropyridin-3-yl)piperazine-1-carboxylate

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CAS No.

: 1779124-68-3

Mol F.

: C14H20N4O4

Mol W.

: 308.33

Cat No.

: SA40431

Brexpiprazole, Impurities

tert-Butyl 4-(4-(2-oxo-1,2-dihydroquinolin-7-yloxy)butyl)piperazine-1-carboxylate

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CAS No.

: NA

Mol F.

: C22H31N3O4

Mol W.

: 401.5

Cat No.

: SA41336

Impurities, Palbociclib

tert-Butyl 4-(6-(hydroxyamino)pyridin-3-yl)piperazine-1-carboxylate

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CAS No.

Mol F.

: C14H22N4O3

Mol W.

: 294.35

Cat No.

: SA40433

Impurities, Rosuvastatin

tert-Butyl 6-Chloro-(R)-hydroxy-3-oxohexanoate

$150.00 25 mg

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CAS No.

: 404958-08-3

Mol F.

: C10H17ClO4

Mol W.

: 236.69

Cat No.

: SA12152

Cetirizine, Impurities

tert-Butyl Cetirizine

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CAS No.

: 335017-46-4

Mol F.

: C₂₅H₃₃ClN₂O₃

Mol W.

: 444.99

Cat No.

: SA13512

Impurities, Terbinafine

tert-Butylethyne

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CAS No.

: 917-92-0

Mol F.

: C6H10

Mol W.

: 82.14

Cat No.

: SA25714

Impurities, Testosterone

Testosterone Cypionate

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CAS No.

: 58-20-8

Mol F.

: C27H40O3

Mol W.

: 412.61

Cat No.

: SA16220

Dapagliflozin, Impurities

Tetraacetate Bromo Dapagliflozin

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CAS No.

: 1807632-96-7

Mol F.

: C29H33BrO10

Mol W.

: 621.48

Cat No.

: SA15065

Dapagliflozin, Impurities

Tetraacetate Deschloro Dapagliflozin

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CAS No.

: 2437569-58-7

Mol F.

: C29H34O10

Mol W.

: 542.58

Cat No.

: SA15066

Dapagliflozin, Impurities

Tetraacetate o-Bromo Dapagliflozin

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CAS No.

Mol F.

: C29H33BrO10

Mol W.

: 621.47

Cat No.

: SA15068

Dapagliflozin, Impurities

Tetraacetate o-Chloro Dapagliflozin

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CAS No.

Mol F.

: C29H33ClO10

Mol W.

: 577

Cat No.

: SA15067

Impurities, Tetracaine

Tetracaine (API) | CAS : 94-24-6

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CAS No.

: 94-24-6

Mol F.

: C15H24N2O2

Mol W.

: 264.2

Cat No.

: SA52600

Impurities, Tetracaine

Tetracaine EP Impurity A | CAS : 150-13-0

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CAS No.

: 150-13-0

Mol F.

: C7H7NO2

Mol W.

: 137.1

Cat No.

: SA52601

Impurities, Tetracaine

Tetracaine EP Impurity B | CAS : 4740-24-3

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CAS No.

: 4740-24-3

Mol F.

: C11H15NO2

Mol W.

: 193.3

Cat No.

: SA52602

Impurities, Tetracaine

Tetracaine EP Impurity C | CAS : 71839-12-8

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CAS No.

: 71839-12-8

Mol F.

: C12H17NO2

Mol W.

: 207.3

Cat No.

: SA52603

Empagliflozin, Impurities

Tetrahydrofuran-3-yl 4-hydroxybutanoate

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CAS No.

Mol F.

: C8H14O4

Mol W.

: 174.19

Cat No.

: SA15147

Deferasirox, Impurities

Tetrasalicylide

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CAS No.

: 6543-57-3

Mol F.

: C28H16O8

Mol W.

: 480.42

Cat No.

: SA25113

Bosentan, Impurities

Tezosentan

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CAS No.

: 180384-57-0

Mol F.

: C27H27N9O6S

Mol W.

: 605.63

Cat No.

: SA28606

Diazepam, Impurities

Thionordiazepam

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CAS No.

Mol F.

: C15H11ClN2S

Mol W.

: 286.77

Cat No.

: SA20508

Impurities, Levothyroxine

Thyroxine

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CAS No.

: 51-48-9

Mol F.

: C15H11I4NO4

Mol W.

: 776.87

Cat No.

: SA24729

Impurities, Tibolone

Tibolone

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CAS No.

: 5630-53-5

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA21905

Impurities, Tibolone

Tibolone EP impurity D

$1,800.00 25 mg

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CAS No.

: 32297-45-3

Mol F.

: C21H28O2

Mol W.

: 312.45

Cat No.

: SA21903

Impurities, Ticagrelor

Ticagrelor (1S)-Epimer

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CAS No.

: 2435586-40-4

Mol F.

: C23H28F2N6O4S

Mol W.

: 522.57

Cat No.

: SA32501

Impurities, Ticagrelor

Ticagrelor (2R)-Epimer

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CAS No.

: 2056269-94-2

Mol F.

: C23H28F2N6O4S

Mol W.

: 522.57

Cat No.

: SA32502

Impurities, Ticagrelor

Ticagrelor Acetate

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CAS No.

: 1616703-93-5

Mol F.

: C25H30F2N6O5S

Mol W.

: 564.6

Cat No.

: SA32503

Impurities, Ticagrelor

Ticagrelor Acetonide

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CAS No.

: 274693-26-4

Mol F.

: C26H32F2N6O4S

Mol W.

: 562.63

Cat No.

: SA32504

Impurities, Ticagrelor

Ticagrelor Deshydroxyethyl Impurity

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CAS No.

: 220347-05-7

Mol F.

: C21H24F2N6O3S

Mol W.

: 478.52

Cat No.

: SA32505

Impurities, Ticagrelor

Ticagrelor IP Impurity A

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CAS No.

: 1251765-07-7

Mol F.

: C14H22N6O4S

Mol W.

: 370.43

Cat No.

: SA32507

Impurities, Ticagrelor

Ticagrelor IP Impurity B

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CAS No.

: 1788033-05-5

Mol F.

: C23H28F2N6O4S

Mol W.

: 522.57

Cat No.

: SA32508

Impurities, Tigecycline

Tigecycline

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CAS No.

: 220620-09-7

Mol F.

: C29H39N5O8

Mol W.

: 585.66

Cat No.

: SA48900

Impurities, Timolol

Timolol EP Impurity J

$1,500.00 25 mg

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CAS No.

Mol F.

: C16H32N4O4S

Mol W.

: 376.51

Cat No.

: SA23209

Impurities, Tiotropium

Tiotropium EP Impurity A

$80.00 25 mg

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CAS No.

: 4746-63-8

Mol F.

: C10H8O3S2

Mol W.

: 240.3

Cat No.

: SA11701

Impurities, Tizanidine

Tizanidine | CAS : 51322-75-9

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CAS No.

: 51322-75-9

Mol F.

: C9H8ClN5S

Mol W.

: 253.7

Cat No.

: SA52100

Impurities, Tizanidine

Tizanidine 5-Hydroxy Impurity | CAS : 1794829-08-5

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CAS No.

: 1794829-08-5

Mol F.

: C9H9Cl2N5OS

Mol W.

: 306.2

Cat No.

: SA52113

Impurities, Tizanidine

Tizanidine Dehydro Impurity | CAS : 125292-34-4

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CAS No.

: 125292-34-4

Mol F.

: C9H6ClN5S

Mol W.

: 251.7

Cat No.

: SA52114