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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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Doxazosin

Doxazosin EP Impurity D

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CAS No.

: 28888-44-0

Mol F.

: C10H10N2O4

Mol W.

: 222.2

Cat No.

: SA64907

Impurities, Prazosin

Doxazosin EP Impurity D

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CAS No.

: 28888-44-0

Mol F.

: C10H10N2O4

Mol W.

: 222.2

Cat No.

: SA24205

Doxazosin

Doxazosin EP Impurity E

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CAS No.

: 27631-29-4

Mol F.

: C10H8Cl2N2O2

Mol W.

: 259.1

Cat No.

: SA64908

Doxazosin

Doxazosin EP Impurity F

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CAS No.

: 23680-84-4

Mol F.

: C10H10ClN3O2

Mol W.

: 239.7

Cat No.

: SA64909

Doxazosin

Doxazosin EP Impurity G

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CAS No.

: 60547-97-9; 60548-08-5 (HCl Salt)

Mol F.

: C14H19N5O2

Mol W.

: 289.3

Cat No.

: SA64910

Doxazosin

Doxazosin EP Impurity H

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CAS No.

: 102839-00-9

Mol F.

: C24H28N8O4

Mol W.

: 492.5

Cat No.

: SA64911

Doxepin, Impurities

Doxepin

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CAS No.

: 1229-29-4

Mol F.

: C19H21NO

Mol W.

: 279.38

Cat No.

: SA29900

Doxepin, Impurities

Doxepin EP Impurity A

$95.00 100 mg

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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

$210.00 100 mg

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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

$490.00 100 mg

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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

Doxofylline

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CAS No.

: 69975-86-6

Mol F.

: C11H14N4O4

Mol W.

: 266.26

Cat No.

: SA58400

Doxycycline

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CAS No.

: 564-25-0; 24390-14-5 (Hyclate); 17086-28-1 (Monohydrate); 10592-13-9 (HCl Salt);

Mol F.

: C22H24N2O8

Mol W.

: 444.4

Cat No.

: SA64800

Doxycycline

Doxycycline EP Impurity A

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CAS No.

: 3219-99-6; 41411-66-9 (HCl Salt)

Mol F.

: C22H24N2O8

Mol W.

: 444.4

Cat No.

: SA64801

Doxycycline

Doxycycline EP Impurity B

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CAS No.

: 3963-95-9; 914-00-1(Freebase)

Mol F.

: C22H22N2O8 : HCl

Mol W.

: 442.4 : 36.5

Cat No.

: SA64802

Doxycycline

Doxycycline EP Impurity C

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CAS No.

: 6543-77-7

Mol F.

: C22H24N2O8

Mol W.

: 444.4

Cat No.

: SA64803

Doxycycline

Doxycycline EP Impurity D

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CAS No.

: 97583-08-9

Mol F.

: C22H24N2O8

Mol W.

: 444.4

Cat No.

: SA64804

Doxycycline

Doxycycline EP Impurity E

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CAS No.

: 79-57-2

Mol F.

: C22H24N2O9

Mol W.

: 460.4

Cat No.

: SA64805

Doxycycline

Doxycycline EP Impurity F

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CAS No.

: 122861-53-4

Mol F.

: C23H25NO8

Mol W.

: 443.5

Cat No.

: SA64806

Doxylamine

Doxylamine Dioxide

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CAS No.

: 105176-70-3

Mol F.

: C17H22N2O3

Mol W.

: 302.4

Cat No.

: SA64700

Doxylamine

Doxylamine EP Impurity A

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CAS No.

: 873407-01-3

Mol F.

: C17H22N2O

Mol W.

: 270.4

Cat No.

: SA64701

Doxylamine

Doxylamine EP Impurity B

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CAS No.

: 19490-92-7; 879671-67-7(HCl Salt)

Mol F.

: C13H13NO

Mol W.

: 199.2

Cat No.

: SA64702

Doxylamine

Doxylamine EP Impurity C

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CAS No.

: 1442-21-3; 1221-70-1(Freebase);

Mol F.

: C16H20N2O : HCl

Mol W.

: 256.3 : 36.5

Cat No.

: SA64703

Doxylamine

Doxylamine EP Impurity D

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CAS No.

: 91-02-1

Mol F.

: C12H9NO

Mol W.

: 183.2

Cat No.

: SA64704

Doxylamine

Doxylamine Ethylamine N-Oxide

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CAS No.

: 97143-65-2; 2575516-53-7 (HCl Salt);

Mol F.

: C17H22N2O2

Mol W.

: 286.4

Cat No.

: SA64705

Doxylamine

Doxylamine Pyridinyl-N-oxide

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CAS No.

: 99430-77-0

Mol F.

: C17H22N2O2

Mol W.

: 286.4

Cat No.

: SA64706

Doxylamine

Doxylamine Succinate

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CAS No.

: 562-10-7; 469-21-6(Freebase)

Mol F.

: C17H22N2O : C4H6O4

Mol W.

: 270.4 : 118.1

Cat No.

: SA64708

Dropropizine

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CAS No.

: 17692-31-8

Mol F.

: C13H20N2O2

Mol W.

: 236.3

Cat No.

: SA64600

Dropropizine

Dropropizine N-Oxide

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CAS No.

: 152323-00-7

Mol F.

: C13H20N2O3

Mol W.

: 252.3

Cat No.

: SA64603

Dropropizine

Dropropizine N,N-Dioxide

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CAS No.

: 152237-41-7

Mol F.

: C13H20N2O4

Mol W.

: 268.3

Cat No.

: SA64602

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

DROSPIRENONE, Impurities

Drospirenone EP Impurity A

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CAS No.

: 67372-68-3

Mol F.

: C23H30O3

Mol W.

: 354.5

Cat No.

: SA53003

DROSPIRENONE, Impurities

Drospirenone EP Impurity B

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CAS No.

: 3068810-10-3

Mol F.

: C24H32O4

Mol W.

: 384.51

Cat No.

: SA53004

DROSPIRENONE, Impurities

Drospirenone EP Impurity D

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CAS No.

: 67372-69-4

Mol F.

: C23H28O3

Mol W.

: 352.5

Cat No.

: SA53005

DROSPIRENONE, Impurities

Drospirenone EP Impurity F

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CAS No.

: NA

Mol F.

: C24H32O3

Mol W.

: 368.5

Cat No.

: SA53006

DROSPIRENONE, Impurities

Drospirenone EP Impurity G

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CAS No.

: 932388-90-4

Mol F.

: C24H31ClO3

Mol W.

: 403.0

Cat No.

: SA53007

DROSPIRENONE, Impurities

Drospirenone EP Impurity H

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CAS No.

: 932388-89-1

Mol F.

: C24H31ClO3

Mol W.

: 403.0

Cat No.

: SA53008

DROSPIRENONE, Impurities

Drospirenone EP Impurity I

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CAS No.

: 2896199-04-3

Mol F.

: C24H32O3

Mol W.

: 368.5

Cat No.

: SA53009

DROSPIRENONE, Impurities

Drospirenone EP Impurity K

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CAS No.

: 889652-31-7

Mol F.

: C24H30O3

Mol W.

: 366.5

Cat No.

: SA53010

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

$550.00 25 mg

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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

$450.00 25 mg

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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

Duloxetine, Impurities

Duloxetine Phthalimide 2-Naphthyl Impurity

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CAS No.

: NA

Mol F.

: C26H23NO4S

Mol W.

: 445.53

Cat No.

: SA36322

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