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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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Citalopram, Impurities

Oxime Impurity of Escitalopram oxalate

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CAS No.

: 227954-88-3

Mol F.

: C20H23FN2O2

Mol W.

: 342.41

Cat No.

: SA17021

Diclofenac, Impurities

Oxindole

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CAS No.

: 59-48-3

Mol F.

: C₈H₇NO

Mol W.

: 133.15

Cat No.

: SA12710

Impurities, Indacaterol

Oxo-indacaterol

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CAS No.

: NA

Mol F.

: C24H26N2O4

Mol W.

: 406.5

Cat No.

: SA48707

Ciprofloxacin, Impurities

Oxociprofloxacin

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CAS No.

: 103237-52-1

Mol F.

: C17H16FN3O4

Mol W.

: 345.33

Cat No.

: SA42012

Impurities, Oxymetazoline

Oxymetazoline EP Impurity A

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CAS No.

: 1391053-50-1

Mol F.

: C16H27ClN2O2

Mol W.

: 314.85

Cat No.

: SA44201

Impurities, Oxymetazoline

Oxymetazoline HCl

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CAS No.

: 2315-02-8

Mol F.

: C16H25ClN2O

Mol W.

: 296.84

Cat No.

: SA44207

Impurities, Oxymetazoline

Oxymetazoline Nitroso Impurity 1

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CAS No.

: NA

Mol F.

: C16H23N3O2

Mol W.

: 289.39999999999998

Cat No.

: SA44206

Impurities, Salmeterol

P-Bromophenyl Dibenzyl Salmeterol

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CAS No.

: NA

Mol F.

: C39H48BrNO4

Mol W.

: 674.71

Cat No.

: SA10119

Impurities, Tolterodine

P-Cresol Tolterodine impurity

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CAS No.

: 106-44-5

Mol F.

: C7H8O

Mol W.

: 108.14

Cat No.

: SA28206

Ezetimibe, Impurities

P-Fluoro (R)-Oxazolidone

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CAS No.

: 404874-93-7

Mol F.

: C21H20FNO3

Mol W.

: 353.39

Cat No.

: SA14849

Impurities, Levomilnacipran

p-Hydroxy Levomilnacipran Hydrochloride

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CAS No.

: 688320-03-8

Mol F.

: C₁₅H₂₂N₂O₂•HCl

Mol W.

: 262.35

Cat No.

: SA29201

Impurities, Levomilnacipran

p-Hydroxy-Levomilnacipran Carbamoyl-β-D-glucuronide

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CAS No.

: NA

Mol F.

: C₂₂H₃₀N₂O₁₀

Mol W.

: 482.48

Cat No.

: SA29202

Ezetimibe, Impurities

P-Methyl oxazolidone

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CAS No.

Mol F.

: C21H21NO4

Mol W.

: 351.39

Cat No.

: SA14844

Ezetimibe, Impurities

p-Tolyl Keto Pentanoic Acid | CAS : 833-85-2

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CAS No.

: 833-85-2

Mol F.

: C12H14O3

Mol W.

: 206.24

Cat No.

: SA14861

Impurities, Palbociclib

Palbociclib

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CAS No.

: 571190-30-2

Mol F.

: C24H29N7O2

Mol W.

: 447.53

Cat No.

: SA40400

Impurities, Palbociclib

Palbociclib 2-Hydroxy Acetyl Impurity

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CAS No.

: 2172256-78-7

Mol F.

: C15H17N3O3

Mol W.

: 287.3

Cat No.

: SA40430

Impurities, Palbociclib

Palbociclib 7A Regio-Isomer Impurity

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CAS No.

: 1941177-47-4

Mol F.

: C33H45N7O4

Mol W.

: 603.75

Cat No.

: SA40442

Impurities, Palbociclib

Palbociclib Des Acetyl N-Oxide

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CAS No.

Mol F.

: C22H27N7O2

Mol W.

: 421.5

Cat No.

: SA40440

Impurities, Palbociclib

Palbociclib Impurity 93

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CAS No.

: 2410426-60-5

Mol F.

: C22H30BrN5O3

Mol W.

: 492.41

Cat No.

: SA40441

Impurities, Palbociclib

Palbociclib Maleic Acid Adduct

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CAS No.

Mol F.

: C28H31N7O5

Mol W.

: 545.6

Cat No.

: SA40443

Palbociclib

Palbociclib N-Acetic Acid

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CAS No.

: 2363160-84-1

Mol F.

: C22H24N6O4

Mol W.

: 505.57

Cat No.

: SA40402

Impurities, Palbociclib

Palbociclib Nitroso Piperazine Amine

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CAS No.

Mol F.

: C9H13N5O

Mol W.

: 207.23

Cat No.

: SA40438

Impurities, Palbociclib

Palbociclib Sulfate Sodium Salt

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CAS No.

: NA

Mol F.

: C24H28N7NaO5S

Mol W.

: 549.58

Cat No.

: SA40403

Impurities, Paliperidone

Paliperidone

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CAS No.

: 144598-75-4

Mol F.

: C23H27FN4O3

Mol W.

: 426.2

Cat No.

: SA49200

Impurities, Paliperidone

Paliperidone Hydroxybenzoyl Derivative | CAS : 152542-03-5

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CAS No.

: 152542-03-5

Mol F.

: C23H28FN3O4

Mol W.

: 429.5

Cat No.

: SA49207

Impurities, Paliperidone

Paliperidone Ketone Impurity | CAS : 1189516-65-1

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CAS No.

: 1189516-65-1

Mol F.

: C23H25FN4O3

Mol W.

: 424.19

Cat No.

: SA49206

Impurities, Paliperidone

Paliperidone USP Related Compound A

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CAS No.

: 849903-79-3

Mol F.

: C11H16N2O2

Mol W.

: 208.3

Cat No.

: SA49201

Impurities, Paliperidone

Paliperidone USP Related Compound B

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CAS No.

: 84163-77-9

Mol F.

: C12H13FN2O

Mol W.

: 220.2

Cat No.

: SA49202

Impurities, Paliperidone

Paliperidone USP Related Compound C

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CAS No.

: 130049-82-0

Mol F.

: C11H15ClN2O2

Mol W.

: 242.7

Cat No.

: SA49203

Impurities, Paliperidone

Paliperidone USP Related Compound D

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CAS No.

: 761460-08-6

Mol F.

: C23H27FN4O4

Mol W.

: 442.5

Cat No.

: SA49204

Impurities, Paliperidone

Paliperidone Z-Oxime

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CAS No.

: 1388021-47-3

Mol F.

: C23H28F2N4O3

Mol W.

: 446.5

Cat No.

: SA49205

Fingolimod, Impurities

Palmitate Amide Fingolimod Impurity

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CAS No.

: 1242271-26-6

Mol F.

: C35H63NO3

Mol W.

: 545.88

Cat No.

: SA34519

Impurities, Nitrosamine

Palonosetron Hydrochloride nitrosamine impurity

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CAS No.

: NA

Mol F.

: C15H21N3O

Mol W.

: 259.35

Cat No.

: SA44609

Impurities, Pantoprazole

Pantoprazole

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CAS No.

: 102625-70-7

Mol F.

: C₁₆H₁₅F₂N₃O₄S

Mol W.

: 383.4

Cat No.

: SA29100

Impurities, Pantoprazole

Pantoprazole EP Impurity A

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CAS No.

: 127780-16-9

Mol F.

: C16H15F2N3O5S

Mol W.

: 399.37

Cat No.

: SA29101

Impurities, Pantoprazole

Pantoprazole EP Impurity B

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CAS No.

: 102625-64-9

Mol F.

: C16H15F2N3O3S

Mol W.

: 367.37

Cat No.

: SA29102

Impurities, Pantoprazole

Pantoprazole EP Impurity C

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CAS No.

: 97963-62-7

Mol F.

: C8H6F2N2OS

Mol W.

: 216.21

Cat No.

: SA29103

Impurities, Pantoprazole

Pantoprazole EP Impurity D

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CAS No.

: 624742-53-6

Mol F.

: C17H17F2N3O4S

Mol W.

: 397.4

Cat No.

: SA29104

Impurities, Pantoprazole

Pantoprazole N-Methyl 5-Difluoromethoxy Thiol Impurity

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CAS No.

: NA

Mol F.

: C9H10N2OS

Mol W.

: 230.23

Cat No.

: SA29111

Impurities, Pantoprazole

Pantoprazole N-Methyl 6-Difluoromethoxy Thiol Impurity

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CAS No.

: NA

Mol F.

: C9H10N2OS

Mol W.

: 230.23

Cat No.

: SA29112

Impurities, Pantoprazole

Pantoprazole N-Oxide

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CAS No.

: 953787-60-5

Mol F.

: C16H15F2N3O5S

Mol W.

: 399.37

Cat No.

: SA29108

Impurities, Pantoprazole

Pantoprazole Sulfide N-Methyl 5-Difluoromethoxy Analog

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CAS No.

: NA

Mol F.

: C17H17F2N3O3S

Mol W.

: 381.4

Cat No.

: SA29109

Impurities, Pantoprazole

Pantoprazole Sulfide N-Methyl 6-Difluoromethoxy Analog

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CAS No.

: NA

Mol F.

: C17H17F2N3O3S

Mol W.

: 381.4

Cat No.

: SA29110

Impurities, Pantoprazole

Pantoprazole Sulfone N-Oxide

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CAS No.

: 953787-55-8

Mol F.

: C16H15F2N3O6S

Mol W.

: 415.37

Cat No.

: SA29107

Paroxetine

Paroxetine Dimer N-Methyl Analog

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CAS No.

Mol F.

: C41H44F2N2O6

Mol W.

: 698.79

Cat No.

: SA18313

Paroxetine

Paroxetine Hydrochloride

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CAS No.

: 78246-49-8; 61869-08-7 (free base)

Mol F.

: C₁₉H₂₁ClFNO₃

Mol W.

: 365.83

Cat No.

: SA18314

Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity A; Desfluoroparoxetine Hydrochloride

$550.00 25 mg

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CAS No.

: 1394842-91-1

Mol F.

: C19H21NO3

Mol W.

: 311.37

Cat No.

: SA18306

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity B

$80.00 25 mg

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CAS No.

: 533-31-3

Mol F.

: C7H6O3

Mol W.

: 138.12

Cat No.

: SA18308

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity F

$350.00 25 mg

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CAS No.

: 105813-39-6; 105813-40-9

Mol F.

: C26H27NO3

Mol W.

: 401.5

Cat No.

: SA18307

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity J

$1,550.00 25 mg

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CAS No.

Mol F.

: C25H24FNO3

Mol W.

: 405.46

Cat No.

: SA18302