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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

Venlafaxine EP Impurity A

$125.00 25 mg

In Stock

CAS No.

: 775-33-7; 50822-98-5

Mol F.

: C11H17NO

Mol W.

: 179.26

Cat No.

: SA22700

Impurities, Venlafaxine

Venlafaxine EP Impurity C

$95.00 25 mg

In Stock

CAS No.

: 130198-05-9

Mol F.

: C15H24ClNO2

Mol W.

: 285.81

Cat No.

: SA22702

Impurities, Venlafaxine

Venlafaxine EP Impurity D; Venlafaxine USP Related Compound A

$95.00 25 mg

In Stock

CAS No.

: 93413-90-2; 149289-30-5 (Free base)

Mol F.

: C16H26ClNO2

Mol W.

: 299.84

Cat No.

: SA22707

Impurities, Venlafaxine

Venlafaxine EP Impurity F

$145.00 25 mg

In Stock

CAS No.

: 93413-79-7; 93413-57-1

Mol F.

: C17H26ClNO

Mol W.

: 295.85

Cat No.

: SA22709

Impurities, Venlafaxine

Venlafaxine EP Impurity G

$95.00 25 mg

In Stock

CAS No.

: 1076199-92-2; 2108968-20-1

Mol F.

: C17H28ClNO

Mol W.

: 297.86

Cat No.

: SA22710

Impurities, Venlafaxine

Venlafaxine EP Impurity H

$190.00 25 mg

In Stock

CAS No.

: 1329795-88-1

Mol F.

: C24H33NO3

Mol W.

: 383.52

Cat No.

: SA22703

Impurities, Venlafaxine

Venlafaxine HCl

Please enquire for price & pack size

In Stock

CAS No.

: 99300-78-4

Mol F.

: C17H28ClNO2

Mol W.

: 313.86

Cat No.

: SA22711

Impurities, Venlafaxine

Venlafaxine N-Oxide

$120.00 25 mg

In Stock

CAS No.

: 1094598-37-4

Mol F.

: C17H27NO3

Mol W.

: 293.4

Cat No.

: SA22712

Impurities, Venlafaxine

Venlafaxine O-Desmethyl

$78.00 25 mg

In Stock

CAS No.

: 93413-62-8

Mol F.

: C16H25NO2

Mol W.

: 263.38

Cat No.

: SA22713

Impurities, Venlafaxine

Venlafaxine O-Desmethyl N-Desmethyl

$195.00 25 mg

In Stock

CAS No.

: 135308-74-6

Mol F.

: C15H23NO2

Mol W.

: 249.35

Cat No.

: SA22715

Impurities, Venlafaxine

Venlafaxine O-Desmethyl N,N-Didesmethyl

$395.00 25 mg

In Stock

CAS No.

: 149289-29-2; 135308-76-8

Mol F.

: C14H21NO2

Mol W.

: 235.32

Cat No.

: SA22714

Impurities, Vildagliptin

Vildagliptin (2R)-Isomer

$245.00 25 mg

In Stock

CAS No.

: 1036959-27-9

Mol F.

: C17H25N3O2

Mol W.

: 303.4

Cat No.

: SA23906

Impurities, Vildagliptin

Vildagliptin Amide Impurity

$135.00 25 mg

In Stock

CAS No.

: 565453-39-6

Mol F.

: C17H27N3O3

Mol W.

: 321.41

Cat No.

: SA23907

Impurities, Vildagliptin

Vildagliptin Amino Alcohol Impurity

$125.00 25 mg

In Stock

CAS No.

: 702-82-9

Mol F.

: C10H17NO

Mol W.

: 167.25

Cat No.

: SA23911

Impurities, Vildagliptin

Vildagliptin Carboxylic Acid Impurity

$155.00 25 mg

In Stock

CAS No.

: 565453-40-9(Base)

Mol F.

: C17H25LiN2O4

Mol W.

: 328.33

Cat No.

: SA23908

Impurities, Vildagliptin

Vildagliptin Chloroacetyl Amide (S)-Isomer

$135.00 25 mg

In Stock

CAS No.

: 214398-99-9

Mol F.

: C7H11ClN2O2

Mol W.

: 190.63

Cat No.

: SA23900

Impurities, Vildagliptin

Vildagliptin Chloroacetyl Nitrile (R)-Isomer

$145.00 25 mg

In Stock

CAS No.

: 565452-98-4

Mol F.

: C7H9ClN2O

Mol W.

: 172.61

Cat No.

: SA23901

Impurities, Vildagliptin

Vildagliptin Chloroacetyl Nitrile (S)-Isomer

$135.00 25 mg

In Stock

CAS No.

: 207557-35-5

Mol F.

: C7H9ClN2O

Mol W.

: 172.61

Cat No.

: SA23903

Impurities, Vildagliptin

Vildagliptin Deshydroxy Impurity

$155.00 25 mg

In Stock

CAS No.

: 741657-02-3

Mol F.

: C17H25N3O

Mol W.

: 287.4

Cat No.

: SA23915

Impurities, Vildagliptin

Vildagliptin Dimer Impurity

$155.00 25 mg

In Stock

CAS No.

: 1036959-23-5

Mol F.

: C24H33N5O3

Mol W.

: 439.55

Cat No.

: SA23912

Impurities, Vildagliptin

Vildagliptin N-Nitroso-L-Prolinaminde

Please enquire for price & pack size

In Stock

CAS No.

: 79108-51-3

Mol F.

: C5H9N3O2

Mol W.

: 143.1

Cat No.

: SA23919

Impurities, Nitrosamine

Vortioxetine Hydrobromide nitrosamine impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2925447-38-5

Mol F.

: C18H21N3OS

Mol W.

: 327.44

Cat No.

: SA44606

Impurities, Vortioxetine

Vortioxetine Sulfoxide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1429908-35-9

Mol F.

: C18H22N2OS

Mol W.

: 314.45

Cat No.

: SA50301

Impurities, Zidovudine

Zidovudine EP Impurity A

$75.00 25 mg

In Stock

CAS No.

: 3056-17-5

Mol F.

: C10H12N2O4

Mol W.

: 224.21

Cat No.

: SA12604

Impurities, Zidovudine

Zidovudine EP Impurity B

$155.00 25 mg

In Stock

CAS No.

: 25526-94-7

Mol F.

: C10H13ClN2O4

Mol W.

: 260.67

Cat No.

: SA12602

Impurities, Zidovudine

Zidovudine EP Impurity C

$70.00 25 mg

In Stock

CAS No.

: 65-71-4

Mol F.

: C5H6N2O2

Mol W.

: 126.11

Cat No.

: SA12605

Impurities, Zolmitriptan

Zolmitriptan EP impurity C | CAS : 1350928-05-0

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

Mol W.

Cat No.

: SA11910

Impurities, Zolmitriptan

Zolmitriptan Hydroxymethyl Impurity (USP)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C17H23N3O3

Mol W.

: 317.4

Cat No.

: SA11909

Impurities, Zolmitriptan

Zolmitriptan N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 251451-30-6

Mol F.

: C16H21N3O3

Mol W.

: 303.36

Cat No.

: SA11903

Impurities, Zolmitriptan

Zolmitriptan R-Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 139264-24-7

Mol F.

: C16H21N3O2

Mol W.

: 287.36

Cat No.

: SA11901

Impurities, Zolmitriptan

Zolmitriptan USP Related Compound A

Please enquire for price & pack size

In Stock

CAS No.

: 139264-35-0

Mol F.

: C15H19N3O2

Mol W.

: 273.33

Cat No.

: SA11904

Brivaracetam, Impurities

αR-Brivaracetam

$395.00 25 mg

In Stock

CAS No.

: 357337-00-9

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47304

Brivaracetam, Impurities

αR,4S-Brivaracetam

$395.00 25 mg

In Stock

CAS No.

: 357336-99-3

Mol F.

: C11H20N2O2

Mol W.

: 212.29

Cat No.

: SA47302

Impurities, Propranolol

β-Naphthol

Please enquire for price & pack size

In Stock

CAS No.

: 135-19-3

Mol F.

: C10H8O

Mol W.

: 144.173

Cat No.

: SA24614

Fluorometholone, Impurities

Δ-16(17)-Fluorometholone

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H27FO3

Mol W.

: 358.45

Cat No.

: SA38413

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone

Please enquire for price & pack size

In Stock

CAS No.

: 110664-42-1

Mol F.

: C22H28O3

Mol W.

: 340.45

Cat No.

: SA38412

Hydrocortisone Valerate, Impurities

Δ9(11)-Hydrocortisone-17-valerate

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C26H36O5

Mol W.

: 428.56

Cat No.

: SA27306

Impurities, Lamivudine

(±)-Trans-lamivudine (Mixture of Diastereomers)

Please enquire for price & pack size

Limited Stock

CAS No.

: 141434-39-1

Mol F.

: C8H11N3O3S

Mol W.

: 229.3

Cat No.

: SA22322

Impurities, Tadalafil

(1S, 3S) Open Ring Tadalafil Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 629652-42-2

Mol F.

: C₂₂H₁₉ClN₂O₅

Mol W.

: 426.85

Cat No.

: SA20904

Impurities, Lamivudine

(2R,5S)-L-Menthol-5-(4-amino-2-oxo-1(2H)-pyrimidinyl)-1,3-oxathiolane-2-carboxylate

Please enquire for price & pack size

Limited Stock

CAS No.

: 147027-10-9

Mol F.

: C₁₈H₂₇N₃O₄S

Mol W.

: 381.49

Cat No.

: SA22308

Impurities, Norethindrone

∆-5(10)-Norethindrone Acetate; Norethisterone Acetate EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 19637-28-6

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13401

Clotrimazole, Impurities

1-chloro-2-(dichloromethyl)benzene

Please enquire for price & pack size

Limited Stock

CAS No.

: 88-66-4

Mol F.

: C7H5Cl3

Mol W.

: 195.46

Cat No.

: SA11603

Fluorometholone, Impurities

1,2-dihydro Fluorometholone

Please enquire for price & pack size

Limited Stock

CAS No.

: 378-36-9

Mol F.

: C22H31FO4

Mol W.

: 378.48

Cat No.

: SA38410

Betamethasone Dipropionate, Impurities

1,2-Dihydro-Betamethasone

$195.00 25 mg

Limited Stock

CAS No.

: 560-34-9

Mol F.

: C22H31FO5

Mol W.

: 394.48

Cat No.

: SA14511

Impurities, Triamcinolone Acetonide

1,2-Dihydrotriamcinolone

$95.00 25 mg

Limited Stock

CAS No.

Mol F.

: C21H29FO6

Mol W.

: 396.45

Cat No.

: SA30215

Impurities, Oxcarbazepine

11-Keto Oxcarbazepine; Oxcarbazepine EP Impurity I

$395.00 25 mg

Limited Stock

CAS No.

: 537693-29-1

Mol F.

: C15H10N2O3

Mol W.

: 266.25

Cat No.

: SA12501

Impurities, Triamcinolone Acetonide

11-Oxo Triamcinolone

$295.00 25 mg

Limited Stock

CAS No.

: 3107-69-5

Mol F.

: C₂₁H₂₅FO₆

Mol W.

: 392.42

Cat No.

: SA30212

Budesonide, Impurities

16-HPA Impurity N-2

$395.00 25 mg

Limited Stock

CAS No.

Mol F.

: C23H28O6

Mol W.

: 400.46

Cat No.

: SA14130

Impurities, Raloxifene

2-(4-Hydroxyphenyl)benzo[b]thiophen-6-ol Bimesylate

Please enquire for price & pack size

Limited Stock

CAS No.

: 84449-65-0

Mol F.

: C16H14O6S3

Mol W.

: 398.47

Cat No.

: SA24923

Emtricitabine, Impurities

2-epi-Emtricitabine; Emtricitabine 2-Epimer

$245.00 5 mg

Limited Stock

CAS No.

: 145416-34-8

Mol F.

: C₈H₁₀FN₃O₃S

Mol W.

: 247.25

Cat No.

: SA22903