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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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Doxepin, Impurities

Doxepin EP Impurity A

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CAS No.

: 4504-87-4

Mol F.

: C14H10O2

Mol W.

: 210.23

Cat No.

: SA29901

Doxepin, Impurities

Doxepin EP Impurity B

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CAS No.

: 4504-88-5

Mol F.

: C19H23NO2

Mol W.

: 297.39

Cat No.

: SA29902

Doxepin, Impurities

Doxepin EP Impurity D

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CAS No.

: 25127-31-5

Mol F.

: C19H21NO

Mol W.

: 279.38

Cat No.

: SA29904

Doxepin, Impurities

Doxepin N-Desmethyl N-Acetyl Impurity

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CAS No.

: 250331-54-5

Mol F.

: C20H21NO2

Mol W.

: 307.39

Cat No.

: SA29906

Doxepin, Impurities

Doxepin N-Oxide

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CAS No.

: 22684-91-9

Mol F.

: C19H21NO2

Mol W.

: 295.37

Cat No.

: SA29907

DROSPIRENONE, Impurities

Drospirenone | CAS : 67392-87-4

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CAS No.

: 67392-87-4

Mol F.

: C24H30O3

Mol W.

: 366.49

Cat No.

: SA53000

Duloxetine, Impurities

Duloxetine 2-Naphthalenol Impurity

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CAS No.

: 1346599-09-4

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36315

Duloxetine, Impurities

Duloxetine Methylaminopropanol Impurity

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CAS No.

: 116539-56-1

Mol F.

: C8H13NOS

Mol W.

: 171.26

Cat No.

: SA36312

Duloxetine, Impurities

Duloxetine N-Desmethyl

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CAS No.

: 178273-35-3(base);1798887-69-0(Oxalate)

Mol F.

: C17H17NOS

Mol W.

: 283.39

Cat No.

: SA36310

Duloxetine, Impurities

Duloxetine N-Desmethyl (R)-Isomer

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CAS No.

: 1193213-97-6(base)

Mol F.

: C17H17NOS

Mol W.

: 283.39

Cat No.

: SA36314

Duloxetine, Impurities

Duloxetine phthalimide | CAS : 199191-67-8

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CAS No.

: 199191-67-8

Mol F.

: C26H23NO4S

Mol W.

: 445.53

Cat No.

: SA36321

Dutasteride, Impurities

Dutasteride

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CAS No.

: 164656-23-9

Mol F.

: C27H30F6N2O2

Mol W.

: 528.53

Cat No.

: SA35200

Dutasteride, Impurities

Dutasteride 17-Epimer; Dutasteride EP Impurity E

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CAS No.

: 1796930-46-5

Mol F.

: C27H30F6N2O2

Mol W.

: 528.53

Cat No.

: SA35205

Dutasteride, Impurities

Dutasteride EP Impurity B

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CAS No.

: 2512195-98-9

Mol F.

: C21H32N2O2

Mol W.

: 344.49

Cat No.

: SA35202

Dutasteride, Impurities

Dutasteride EP Impurity D

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CAS No.

: NA

Mol F.

: C27H28F6N2O2

Mol W.

: 526.51

Cat No.

: SA35204

Dutasteride, Impurities

Dutasteride EP Impurity G

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CAS No.

: 1430804-85-5

Mol F.

: C27H28F6N2O2

Mol W.

: 526.51

Cat No.

: SA35207

Dutasteride, Impurities

Dutasteride EP Impurity H; Dutasteride α-Dimer

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CAS No.

: 1648593-70-7

Mol F.

: C46H55F6N3O4

Mol W.

: 827.94

Cat No.

: SA35208

Dutasteride, Impurities

Dutasteride EP Impurity I; Dutasteride β-Dimer

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CAS No.

: 1648593-70-7

Mol F.

: C46H55F6N3O4

Mol W.

: 827.94

Cat No.

: SA35209

Impurities, Norgestimate

E-17-Deacetylnorgestimate

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CAS No.

: 74183-55-4

Mol F.

: C21H29NO2

Mol W.

: 327.46

Cat No.

: SA15902

Edoxaban, Impurities

Edoxaban chloro impurity 2

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CAS No.

: 4755-77-5

Mol F.

: C4H5ClO3

Mol W.

: 136.53

Cat No.

: SA33015

Edoxaban, Impurities

Edoxaban Dichloro Dipyridine Impurity

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CAS No.

: NA

Mol F.

: C12H10Cl4N4O2

Mol W.

: 384.05

Cat No.

: SA33029

Edoxaban, Impurities

Edoxaban Impurity B

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CAS No.

: NA

Mol F.

: C24H30ClN7O5S

Mol W.

: 564.07

Cat No.

: SA33026

Edoxaban, Impurities

Edoxaban Impurity C

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CAS No.

: 480452-37-7

Mol F.

: C16H22ClN5O3

Mol W.

: 367.83

Cat No.

: SA33025

Edoxaban, Impurities, Nitrosamine

Edoxaban N-Nitroso Piperidinyl Carboxylic Acid Impurity

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CAS No.

: NA

Mol F.

: C7H7N3O3S

Mol W.

: 213.21

Cat No.

: SA33054

Edoxaban, Impurities

Edoxaban Pyridine N-Oxide Impurity | CAS NO : 2803372-49-6

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CAS No.

: 2803372-49-6

Mol F.

: 2803372-49-6

Mol W.

: 564.1

Cat No.

: SA33052

Edoxaban, Impurities

Edoxaban Thiazole impurity 3

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CAS No.

: 143150-92-9

Mol F.

: C7H9BrN2S

Mol W.

: 233.1

Cat No.

: SA33014

Efavirenz, Impurities

Efavirenz 3-Desoxy

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CAS No.

: 253663-53-5

Mol F.

: C₁₅H₁₁ClF₃NO

Mol W.

: 313.7

Cat No.

: SA17615

Efavirenz, Impurities

Efavirenz Enantiomer | CAS : 154801-74-8

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CAS No.

: 154801-74-8

Mol F.

: C14H11ClF3NO2

Mol W.

: 315.70

Cat No.

: SA17620

Efavirenz, Impurities

Efavirenz Pent-3-ene-1-yne Impurity (USP)

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CAS No.

Mol F.

: C14H9ClF3NO2

Mol W.

: 315.67

Cat No.

: SA17613

Efavirenz, Impurities

Efavirenz USP Related Compound B

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CAS No.

: 440124-96-9

Mol F.

: C14H11ClF3NO2

Mol W.

: 317.69

Cat No.

: SA17604

Efavirenz, Impurities

Efavirenz USP Related Compound C

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CAS No.

: 391860-73-4

Mol F.

: C₁₃H₉ClF₃N

Mol W.

: 271.67

Cat No.

: SA17608

Eletriptan, Impurities

Eletriptan

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CAS No.

: 143322-58-1

Mol F.

: C22H26N2O2S

Mol W.

: 382.52

Cat No.

: SA31400

Eletriptan, Impurities

Eletriptan Dehydro N-Acetyl Impurity

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CAS No.

: 188113-71-5

Mol F.

: C24H26N2O3S

Mol W.

: 422.54

Cat No.

: SA31414

Eletriptan, Impurities

Eletriptan Impurity A

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CAS No.

: 143322-55-8

Mol F.

: C14H18N2

Mol W.

: 214.31

Cat No.

: SA31401

Eletriptan, Impurities

Eletriptan Impurity B

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CAS No.

: 143322-57-0

Mol F.

: C14H17BrN2

Mol W.

: 293.2

Cat No.

: SA31402

Eletriptan, Impurities

Eletriptan Impurity C

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CAS No.

: 188113-72-6

Mol F.

: C22H24N2O2S

Mol W.

: 380.5

Cat No.

: SA31403

Eletriptan, Impurities

Eletriptan Impurity D

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CAS No.

: 1225327-16-1

Mol F.

: C16H15NO2S

Mol W.

: 285.36

Cat No.

: SA31404

Eletriptan, Impurities

Eletriptan Impurity E

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CAS No.

: NA

Mol F.

: C23H24N2O3

Mol W.

: 376.45

Cat No.

: SA31405

Eletriptan, Impurities

Eletriptan Impurity F

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CAS No.

: 209682-64-4

Mol F.

: C₁₆H₂₂N₂

Mol W.

: 242.36

Cat No.

: SA31406

Eletriptan, Impurities

Eletriptan Impurity G

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CAS No.

: NA

Mol F.

: C30H34N2O4S2

Mol W.

: 550.73

Cat No.

: SA31407

Eletriptan, Impurities

Eletriptan Impurity H

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CAS No.

: NA

Mol F.

: C44H50N4O4S2

Mol W.

: 763.02

Cat No.

: SA31408

Eletriptan, Impurities

Eletriptan Impurity I

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CAS No.

: NA

Mol F.

: C44H50N4O4S2

Mol W.

: 763.02

Cat No.

: SA31409

Eletriptan, Impurities

Eletriptan Impurity J

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CAS No.

: 6163-58-2

Mol F.

: C21H21P

Mol W.

: 304.37

Cat No.

: SA31410

Eletriptan, Impurities

Eletriptan Impurity K

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CAS No.

: 6163-63-9

Mol F.

: C21H21OP

Mol W.

: 320.36

Cat No.

: SA31411

Eletriptan, Impurities

Eletriptan Impurity L

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CAS No.

: 1217641-89-8

Mol F.

: C22H26N2O3S

Mol W.

: 398.52

Cat No.

: SA31412

Eletriptan, Impurities

Eletriptan Pseudo Dimer

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CAS No.

: NA

Mol F.

: C44H50N4O4S2

Mol W.

: 763.02

Cat No.

: SA31413

Eltrombopag, Impurities

Eltrombopag

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CAS No.

: 496775-61-2

Mol F.

: C25H22N4O4

Mol W.

: 442.47

Cat No.

: SA51100

Eltrombopag, Impurities

Eltrombopag 2-Aminoethanol Ester impurity

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CAS No.

Mol F.

: C27H27N5O4

Mol W.

: 485.54

Cat No.

: SA51102

Eltrombopag, Impurities

Eltrombopag Acyl Glucuronide

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CAS No.

Mol F.

: C31H30N4O10

Mol W.

: 618.59

Cat No.

: SA51103

Eltrombopag, Impurities

Eltrombopag Amino Impurity

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CAS No.

: 376592-93-7

Mol F.

: C13H11NO3

Mol W.

: 229.2

Cat No.

: SA51106