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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, Terazosin

Terazosin EP Impurity K

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CAS No.

: 19237-84-4

Mol F.

: C19H21N5O4

Mol W.

: 383.4

Cat No.

: SA37311

Impurities, Terazosin

Terazosin EP Impurity L

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CAS No.

: NA

Mol F.

: C9H12N2O2

Mol W.

: 180.2

Cat No.

: SA37312

Impurities, Terazosin

Terazosin EP Impurity M

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CAS No.

: 31350-27-3

Mol F.

: C14H14N2O4

Mol W.

: 274.27

Cat No.

: SA37313

Impurities, Terazosin

Terazosin EP Impurity N

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CAS No.

: 63074-07-7

Mol F.

: C9H16N2O2

Mol W.

: 184.24

Cat No.

: SA37314

Impurities, Terazosin

Terazosin EP Impurity O

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CAS No.

: 547730-06-3

Mol F.

: C14H22N2O4

Mol W.

: 282.33999999999997

Cat No.

: SA37315

Impurities, Terbinafine

Terbinafine

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CAS No.

: 91161-71-6 (base) ; 78628-80-5 (HCl salt)

Mol F.

: C21H25N

Mol W.

: 291.43

Cat No.

: SA25723

Impurities, Terbinafine

Terbinafine Carboxy Impurity

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CAS No.

: 99473-14-0

Mol F.

: C21H23NO2

Mol W.

: 321.41

Cat No.

: SA25706

Impurities, Terbinafine

Terbinafine Carboxy Methyl Ester

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CAS No.

: 1076199-76-2

Mol F.

: C22H25NO2

Mol W.

: 335.44

Cat No.

: SA25707

Impurities, Terbinafine

Terbinafine EP Impurity C

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CAS No.

: 877265-30-0(Salt);187540-01-8(base)

Mol F.

: C21H26ClN

Mol W.

: 327.89

Cat No.

: SA25702

Impurities, Terbinafine

Terbinafine EP Impurity D

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CAS No.

: 877265-33-3(salt);151222-50-3(base)

Mol F.

: C22H28ClN

Mol W.

: 341.92

Cat No.

: SA25703

Impurities, Terbinafine

Terbinafine EP Impurity F

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CAS No.

: 926281-74-5

Mol F.

: C21H26ClN

Mol W.

: 327.89

Cat No.

: SA25705

Impurities, Terbinafine

Terbinafine N-Desmethylcarboxy Impurity

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CAS No.

: 99473-15-1

Mol F.

: C20H21NO2

Mol W.

: 307.39

Cat No.

: SA25708

Impurities, Terbinafine

Terbinafine N-oxide

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CAS No.

: NA

Mol F.

: C21H25NO

Mol W.

: 307.43

Cat No.

: SA25718

Impurities, Terbutaline

Terbutaline

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CAS No.

: 23031-32-5

Mol F.

: C12H19NO3 0.5 H2SO4

Mol W.

: 274.3

Cat No.

: SA29006

Impurities, Terbutaline

Terbutaline 3,5-Dibenzyl Ether

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CAS No.

: 28924-25-6

Mol F.

: C₂₆H₃₁NO₃

Mol W.

: 405.53

Cat No.

: SA29005

Impurities, Terbutaline

Terbutaline EP Impurity A

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CAS No.

: 99-10-5

Mol F.

: C₇H₆O₄

Mol W.

: 154.12

Cat No.

: SA29001

Impurities, Terbutaline

Terbutaline EP Impurity B

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CAS No.

: 153657-83-1(Dihydrate)

Mol F.

: C13H19NO3

Mol W.

: 237.29

Cat No.

: SA29002

Impurities, Terbutaline

Terbutaline EP Impurity C

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CAS No.

: 1246815-70-2

Mol F.

: C12H17NO3

Mol W.

: 223.27

Cat No.

: SA29003

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