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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Impurities, Venlafaxine

O-Desmethyl Venlafaxine Cyclic Impurity

$295.00 25 mg

In Stock

CAS No.

: 1346601-55-5

Mol F.

: C16H23NO2

Mol W.

: 261.36

Cat No.

: SA22726

Impurities, Sofosbuvir

O-Desphenyl O-methyl Sofosbuvir

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C17H27FN3O9P

Mol W.

: 4667.38

Cat No.

: SA15439

Impurities, Sofosbuvir

O-Desphenyl sofosbuvir; Sofosbuvir O-Desphenyl Impurity

$255.00 10 mg

In Stock

CAS No.

: 1233335-82-4

Mol F.

: C16H25FN3O9P

Mol W.

: 453.36

Cat No.

: SA15404

Dolutegravir, Impurities

O-Methyl Dolutegravir Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1335210-35-9

Mol F.

: C21H21F2N3O5

Mol W.

: 433.41

Cat No.

: SA20228

Dapagliflozin, Impurities

O-Pentaacetyl O-Desethyl Dapagliflozin; Pentaacetyl Dapagliflozin

$217.00 25 mg

In Stock

CAS No.

Mol F.

: C29H31ClO11

Mol W.

: 591

Cat No.

: SA15022

Impurities, Irganox

Octadecyl 3-(3-tert-butyl-4-hydroxyphenyl)propanoate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C31H54O3

Mol W.

: 474.41

Cat No.

: SA11102

Impurities, Irganox

Octadecyl-4-hydroxyphenylpropionate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C27H46O3

Mol W.

: 418.65

Cat No.

: SA11103

Impurities, Olmesartan Medoxomil

Olmesartan Alkene N1-Trityl Impurity

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C48H42N6O5

Mol W.

: 782.88

Cat No.

: SA17710

Impurities, Olmesartan Medoxomil

Olmesartan dimer impurity

$495.00 25 mg

In Stock

CAS No.

: 1454571-97-1

Mol F.

: C53H54N12O9

Mol W.

: 1002.41

Cat No.

: SA17706

Impurities, Olmesartan Medoxomil

Olmesartan EP imp A

$80.00 25 mg

In Stock

CAS No.

: 144689-24-7

Mol F.

: C24H26N6O3

Mol W.

: 446.5

Cat No.

: SA17713

Impurities, Olmesartan Medoxomil

Olmesartan EP imp B

$85.00 25 mg

In Stock

CAS No.

: 849206-43-5

Mol F.

: C24H24N6O2

Mol W.

: 428.49

Cat No.

: SA17714

Impurities, Olmesartan Medoxomil

Olmesartan EP imp C

$155.00 25 mg

In Stock

CAS No.

: 879562-26-2

Mol F.

: C29H28N6O5

Mol W.

: 540.21

Cat No.

: SA17715

Impurities, Olmesartan Medoxomil

Olmesartan EP imp D

$95.00 25 mg

In Stock

CAS No.

: 1020157-01-0

Mol F.

: C48H44N6O6

Mol W.

: 800.9

Cat No.

: SA17716

Impurities, Olmesartan Medoxomil

Olmesartan Ethyl Ester

$125.00 25 mg

In Stock

CAS No.

: 144689-23-6

Mol F.

: C27H31N5O3

Mol W.

: 473.57

Cat No.

: SA17719

Impurities, Olmesartan Medoxomil

Olmesartan ethyl ester N-1 trityl analog

$125.00 25 mg

In Stock

CAS No.

: 189400-21-3

Mol F.

: C45H44N6O3

Mol W.

: 716.87

Cat No.

: SA17717

Impurities, Olmesartan Medoxomil

Olmesartan ethyl methyl N2-trityl ethyl ester analouge

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C46H46N6O3

Mol W.

: 730.9

Cat No.

: SA17721

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil

Please enquire for price & pack size

In Stock

CAS No.

: 144689-63-4

Mol F.

: C29H30N6O6

Mol W.

: 558.59

Cat No.

: SA17730

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil Impurity 4

$295.00 25 mg

In Stock

CAS No.

: 95579-71-8

Mol F.

: C5H5ClO3

Mol W.

: 148.544

Cat No.

: SA17704

Impurities, Olmesartan Medoxomil

Olmesartan Trityl Alcohol impurity

$75.00 25 mg

In Stock

CAS No.

: 76-84-6

Mol F.

: C19H16O

Mol W.

: 260.33

Cat No.

: SA17720

Impurities, Olmesartan Medoxomil

Olmesartan trityl Dimer

$255.00 25 mg

In Stock

CAS No.

: 1454571-98-2

Mol F.

: C91H82N12O9

Mol W.

: 1487.7

Cat No.

: SA17705

Dapagliflozin, Impurities

Ortho-Isomer of Dapagliflozin

$195.00 10 mg

In Stock

CAS No.

: 2040305-05-1

Mol F.

: C21H25ClO6

Mol W.

: 408.87

Cat No.

: SA15041

Impurities, Losartan

OTB-tetrazole aldoxime

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C14H11N5O

Mol W.

: 265.27

Cat No.

: SA26728

Eslicarbazepine, Impurities

Oxcarbazepine

Please enquire for price & pack size

In Stock

CAS No.

: 28721-07-5

Mol F.

: C15H12N2O2

Mol W.

: 252.27

Cat No.

: SA28805

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity C

$95.00 25 mg

In Stock

CAS No.

: 21737-58-6

Mol F.

: C14H11NO

Mol W.

: 209.24

Cat No.

: SA12505

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity D; Dibenzazepinodione

$255.00 25 mg

In Stock

CAS No.

: 19579-83-0

Mol F.

: C14H9NO2

Mol W.

: 223.23

Cat No.

: SA12507

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity F

$125.00 25 mg

In Stock

CAS No.

: 28721-08-6

Mol F.

: C16H12ClNO2

Mol W.

: 285.72

Cat No.

: SA12506

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity H

$95.00 25 mg

In Stock

CAS No.

: 4698-11-7

Mol F.

: C15H13NO

Mol W.

: 223.27

Cat No.

: SA12509

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity L

$195.00 25 mg

In Stock

CAS No.

: 2642430-28-0

Mol F.

: C17H14N2O3

Mol W.

: 294.3

Cat No.

: SA12511

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity M; Oxcarbazepine Dimer

$655.00 25 mg

In Stock

CAS No.

: 2642430-32-6

Mol F.

: C30H22N4O3

Mol W.

: 486.52

Cat No.

: SA12512

Impurities, Oxymetazoline

Oxymetazoline EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 1218-35-5

Mol F.

: C16H25ClN2

Mol W.

: 280.84

Cat No.

: SA44202

Impurities, Oxymetazoline

Oxymetazoline EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 55699-13-3

Mol F.

: C14H21NO2

Mol W.

: 235.3

Cat No.

: SA44203

Impurities, Oxymetazoline

Oxymetazoline EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 55699-12-2

Mol F.

: C14H20O3

Mol W.

: 236.3

Cat No.

: SA44204

Impurities, Oxymetazoline

Oxymetazoline EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 55699-10-0

Mol F.

: C14H19NO

Mol W.

: 217.31

Cat No.

: SA44205

Ezetimibe, Impurities

P-Fluoro oxazolidone

$80.00 25 mg

In Stock

CAS No.

: 189028-93-1

Mol F.

: C20H18FNO4

Mol W.

: 355.36

Cat No.

: SA14843

Impurities, Palbociclib

Palbociclib Acetyl BOC impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1651214-74-2

Mol F.

: C29H37N7O4

Mol W.

: 547.7

Cat No.

: SA40428

Impurities, Palbociclib

Palbociclib Succinic Acid Adduct

Please enquire for price & pack size

In Stock

CAS No.

: 1974279-21-4

Mol F.

: C28H33N7O5

Mol W.

: 547.6

Cat No.

: SA40439

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity C

$195.00 25 mg

In Stock

CAS No.

: 105813-14-7

Mol F.

: C₂₆H₂₆FNO₃

Mol W.

: 419.49

Cat No.

: SA18303

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity D

$195.00 25 mg

In Stock

CAS No.

: 130855-30-0; 112058-85-2

Mol F.

: C19H20FNO3

Mol W.

: 329.36

Cat No.

: SA18309

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity G

$150.00 25 mg

In Stock

CAS No.

: 69675-10-1; 1012886-75-7

Mol F.

: C12H14FN

Mol W.

: 191.24

Cat No.

: SA18310

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity H

$250.00 25 mg

In Stock

CAS No.

: 201855-60-9

Mol F.

: C₁₉H₂₂FNO

Mol W.

: 299.38

Cat No.

: SA18304

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity I

$120.00 25 mg

In Stock

CAS No.

: 125224-43-3 (base); 188869-26-3 (trans base); 220548-73-2 (HCl)

Mol F.

: C12H16FNO

Mol W.

: 209.26

Cat No.

: SA18311

Impurities, Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity B

$495.00 25 mg

In Stock

CAS No.

: 127017-74-7; 127017-69-0 (free base)

Mol F.

: C20H23NO4.HCl

Mol W.

: 377.86

Cat No.

: SA18300

Impurities, Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity C

$350.00 25 mg

In Stock

CAS No.

: 1395408-54-4; 1346597-97-4 (HCl Salt); 606968-04-1 (base)

Mol F.

: C21H25NO4. HCl

Mol W.

: 391.9

Cat No.

: SA18301

Impurities, Pemetrexed

Pemetrexed 6-Oxo Diacid Impurity

$450.00 25 mg

In Stock

CAS No.

: 193281-00-4

Mol F.

: C22H25N5O7

Mol W.

: 443.41

Cat No.

: SA32314

Impurities, Pemetrexed

Pemetrexed 6-Oxo Diethyl ester

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H29N5O7

Mol W.

: 499.52

Cat No.

: SA32324

Impurities, Pemetrexed

Pemetrexed 6-Oxo Dimethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 1320346-45-9

Mol F.

: C20H21N5O7

Mol W.

: 443.41

Cat No.

: SA32316

Impurities, Pemetrexed

Pemetrexed Dimethyl Ester

$150.00 25 mg

In Stock

CAS No.

: 155405-81-5

Mol F.

: C22H25N5O6

Mol W.

: 455.46

Cat No.

: SA32309

Impurities, Pemetrexed

Pemetrexed EP Impurity D

$195.00 10 mg

In Stock

CAS No.

: 144051-68-3; 1265908-59-5 (Trisodium salt)

Mol F.

: C25H28N6O9

Mol W.

: 556.52

Cat No.

: SA32305

Impurities, Pemetrexed

Pemetrexed EP Impurity E

$185.00 25 mg

In Stock

CAS No.

: 182009-04-7

Mol F.

: C20H19N5Na2O6

Mol W.

: 471.37

Cat No.

: SA32306

Impurities, Pemetrexed

Pemetrexed Monomethyl Ester 1

$295.00 25 mg

In Stock

CAS No.

: 1265908-63-1

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32318