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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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Desogestrel, Impurities

Desogestrel EP Impurity D

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CAS No.

: 54048-10-1

Mol F.

: C₂₂H₂₈O₂

Mol W.

: 324.46

Cat No.

: SA16504

Desogestrel, Impurities

Desogestrel EP Impurity E

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CAS No.

: 70805-85-5

Mol F.

: C₂₂H₃₀O₂

Mol W.

: 326.47

Cat No.

: SA16505

Desonide, Impurities

Desonide 16-Ene Impurity

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CAS No.

: 3103-17-1

Mol F.

: C21H26O4

Mol W.

: 342.43

Cat No.

: SA19010

Budesonide, Impurities

Desonide 21-Acetate

$125.00 25 mg

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CAS No.

: 25092-25-5

Mol F.

: C26H34O7

Mol W.

: 458.54

Cat No.

: SA14119

Desonide, Impurities

Desonide Isobutyrate

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CAS No.

: 78806-61-8

Mol F.

: C₂₈H₃₈O₇

Mol W.

: 486.6

Cat No.

: SA19003

Desonide, Impurities

Desonide-21-aldehyde Hydrate

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CAS No.

: NA

Mol F.

: C₂₄H₃₂O₇

Mol W.

: 432.51

Cat No.

: SA19004

Impurities, Palbociclib

Desoxo Palbociclib

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CAS No.

: 2204863-06-7

Mol F.

: C24H29N7O

Mol W.

: 431.53

Cat No.

: SA40412

Tenofovir alafenamide

Desphenyl Tenofovir Alafenamide

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CAS No.

: 376633-26-0

Mol F.

: C15H25N6O5P

Mol W.

: 400.38

Cat No.

: SA42407

Impurities, Rilpivirine

Despropenenitrile Bromo Rilpivirine

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CAS No.

: 374067-85-3

Mol F.

: C19H16BrN5

Mol W.

: 394.27

Cat No.

: SA25401

Impurities, Sacubitril

Dessuccinyl Desethyl N-Boc Sacubitril Impurity | CAS : 1012341-50-2

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CAS No.

: 1012341-50-2

Mol F.

: C23H29NO4

Mol W.

: 383.48

Cat No.

: SA40911

Impurities, Sacubitril

Dessuccinyl N-Boc Sacubitril Impurity | CAS : 149709-60-4

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CAS No.

: 149709-60-4

Mol F.

: C25H33NO4

Mol W.

: 411.53

Cat No.

: SA40913

Impurities, Sacubitril

Dessuccinyl Sacubitril Acid Impurity | CAS : 1038924-71-8

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CAS No.

: 1038924-71-8

Mol F.

: C18H22ClNO2

Mol W.

: 319.83

Cat No.

: SA40914

Impurities, Nitrosamine, Valsartan

Desvaleryl Valsartan N-Nitroso Impurity

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CAS No.

: 2254485-68-0

Mol F.

: C19H20N6O3

Mol W.

: 380.4

Cat No.

: SA33323

Dexamethasone, Impurities

Dexamethasone

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CAS No.

: 50-02-2

Mol F.

: C₂₂H₂₉FO₅

Mol W.

: 392.46

Cat No.

: SA15501

Dexamethasone, Impurities

Dexamethasone 21-Propionate Impurity

$255.00 25 mg

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CAS No.

: 3793-10-0

Mol F.

: C25H33FO6

Mol W.

: 448.42

Cat No.

: SA15523

Dexamethasone, Impurities

Dexamethasone EP Impurity A

$1,595.00 25 mg

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CAS No.

Mol F.

: C22H29FO5

Mol W.

: 392.5

Cat No.

: SA15529

Dexamethasone

Dexamethasone EP Impurity K

$500.00 5 mg

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CAS No.

: 1809224-82-5

Mol F.

: C22H26O4

Mol W.

: 354.44

Cat No.

: SA15511

Chlorpheniramine, Impurities

Dexchlorpheniramine EP Impurity A

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CAS No.

: 132-20-7 (maleate salt); 86-21-5 (base)

Mol F.

: C16H20N2

Mol W.

: 240.34

Cat No.

: SA37606

Chlorpheniramine, Impurities

Dexchlorpheniramine EP Impurity B; (R)-Chlorpheniramine;

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CAS No.

: 2188-09-3 (base); 23095-76-3 (maleate salt)

Mol F.

: C16H19ClN2

Mol W.

: 274.79

Cat No.

: SA37607

Chlorpheniramine, Impurities

Dexchlorpheniramine N-Oxide Dihydrochloride

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CAS No.

: 12656-98-3

Mol F.

: C16H19ClN2O

Mol W.

: 290.79

Cat No.

: SA37605

Chlorpheniramine, Impurities

Dexchlorpheniramine; (S)-Chlorpheniramine

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CAS No.

: 2438-32-6

Mol F.

: C16H19ClN2

Mol W.

: 274.79

Cat No.

: SA37608

Impurities, Solifenacin

Di-((3R)-1-Azabicyclo[2.2.2]oct-3-yl)carbonate

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CAS No.

Mol F.

: C15H24N2O3

Mol W.

: 280.36

Cat No.

: SA32620

Ezetimibe, Impurities

Di-desfluoro Ezetimibe

$550.00 25 mg

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CAS No.

: 1251741-03-3

Mol F.

: C24H23NO3

Mol W.

: 373.44

Cat No.

: SA14845

Neomycin

Di-N-Boc Neomycin Impurity 2

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CAS No.

Mol F.

: C21H38N2O11

Mol W.

: 494.53

Cat No.

: SA51407

Impurities, Palbociclib

Di-tert-butyl 4,4′-(2-nitro pyridine-3,5-diyl)bis(piperazine-1-carboxylate)

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CAS No.

Mol F.

: C23H36N6O6

Mol W.

: 492.58

Cat No.

: SA40435

Impurities, Palbociclib

Di-tert-butyl 4,4′-(diazene-1,2- diylbis(pyridine-6,3-diyl))(E)-bis(piperazine-1-carboxylate)

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CAS No.

Mol F.

: C28H40N8O4

Mol W.

: 552.68

Cat No.

: SA40437

Brexpiprazole, Impurities

Di-tert-butyl piperazine-1,4-dicarboxylate

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CAS No.

: 76535-75-6

Mol F.

: C14H26N2O4

Mol W.

: 286.37

Cat No.

: SA41332

Diacerein, Impurities

Diacerein

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CAS No.

: 13739-02-1

Mol F.

: C19H12O8

Mol W.

: 368.29

Cat No.

: SA11000

Diacerein, Impurities

Diacerein EP Impurity A

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CAS No.

: 518-82-1

Mol F.

: C₁₅H₁₀O₅

Mol W.

: 270.24

Cat No.

: SA11008

Diacerein, Impurities

Diacerein EP Impurity B

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CAS No.

: 481-72-1

Mol F.

: C₁₅H₁₀O₅

Mol W.

: 270.24

Cat No.

: SA11004

Diacerein, Impurities

Diacerein EP Impurity C

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CAS No.

: 478-43-3

Mol F.

: C₁₅H₈O₆

Mol W.

: 284.22

Cat No.

: SA11005

Diacerein, Impurities

Diacerein EP Impurity D

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CAS No.

: 875535-35-6

Mol F.

: C17H10O7

Mol W.

: 326.26

Cat No.

: SA11006

Diacerein, Impurities

Diacerein EP Impurity E

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CAS No.

: 875535-36-7

Mol F.

: C₁₇H₁₀O₇

Mol W.

: 326.26

Cat No.

: SA11007

Clomipramine, Impurities

Dialkylated Impurity

$255.00 25 mg

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CAS No.

: 2305824-50-2; 2305824-51-3 (2HCl salt)

Mol F.

: C23H32ClN3

Mol W.

: 385.97

Cat No.

: SA33706

Impurities, Sitagliptin

Diamide Sitagliptin impurity

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CAS No.

Mol F.

: C20H19F6N5O3

Mol W.

: 491.39

Cat No.

: SA10420

Impurities, Varenicline

Diamine Varenicline

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CAS No.

: 808120-35-6

Mol F.

: C11H15N3

Mol W.

: 189.26

Cat No.

: SA39509

Diazepam, Impurities

Diazepam

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CAS No.

: 439-14-5

Mol F.

: C16H13ClN2O

Mol W.

: 284.7

Cat No.

: SA20500

Diazepam, Impurities

Diazepam dimer

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CAS No.

: 3646-61-5

Mol F.

: C26H16Cl2N2

Mol W.

: 427.32

Cat No.

: SA20507

Diazepam, Impurities

Diazepam EP Impurity A

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CAS No.

: 1088-11-5

Mol F.

: C15H11ClN2O

Mol W.

: 270.70

Cat No.

: SA20501

Diazepam, Impurities

Diazepam EP Impurity B

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CAS No.

: 6021-21-2

Mol F.

: C₁₆H₁₃Cl₂NO₂

Mol W.

: 322.19

Cat No.

: SA20502

Diazepam, Impurities

Diazepam EP Impurity C

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CAS No.

: 5220-02-0

Mol F.

: C16H13ClN2O

Mol W.

: 287.47

Cat No.

: SA20503

Diazepam, Impurities

Diazepam EP Impurity D

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CAS No.

: 1022-13-5

Mol F.

: C14H12ClNO

Mol W.

: 245.7

Cat No.

: SA20504

Diazepam, Impurities

Diazepam EP Impurity E

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CAS No.

: 20927-53-1

Mol F.

: C₁₅H₁₁ClN₂O

Mol W.

: 270.70

Cat No.

: SA20505

Diazepam, Impurities

Diazepam N-Oxide

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CAS No.

: 2888-64-4

Mol F.

: C₁₆H₁₃ClN₂O₂

Mol W.

: 300.74

Cat No.

: SA20506

Baclofen, Impurities

Dibaclofen Urea

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CAS No.

: NA

Mol F.

: C21H22Cl2N2O5

Mol W.

: 453.31

Cat No.

: SA28103

Baclofen, Impurities

Dibaclofen Urea Mono Lactum

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CAS No.

: NA

Mol F.

: C21H20Cl2N2O4

Mol W.

: 435.3

Cat No.

: SA28109

Doxepin, Impurities

Dibenz[b,e]oxepin-Δ11(6H),α-acetaldehyde

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CAS No.

: 21324-99-2

Mol F.

: C16H12O2

Mol W.

: 236.26

Cat No.

: SA29910

Fosaprepitant, Impurities

Dibenzyl Phosphate impurity

$60.00 25 mg

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CAS No.

: 1623-08-1

Mol F.

: C14H15O4P

Mol W.

: 278.2

Cat No.

: SA45401

Baclofen, Impurities

Dichloro Baclofen

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CAS No.

: 4846-95-1

Mol F.

: C10H11Cl2NO2

Mol W.

: 248.1

Cat No.

: SA28107

Diclofenac, Impurities

Diclofenac Aldehyde

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CAS No.

: 22121-58-0

Mol F.

: C13H9Cl2NO2

Mol W.

: 266.12

Cat No.

: SA12704