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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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Capecitabine, Impurities

5-Deoxy-5-Fluoro-N4-(methoxy carbonyl) cytidine

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C15H18FN3O8

Mol W.

: 387.32

Cat No.

: SA37814

Etravirine, Impurities

5-Desbromo Etravirine

Please enquire for price & pack size

In Stock

CAS No.

: 939431-68-2

Mol F.

: C20H16N6O

Mol W.

: 356.38

Cat No.

: SA26107

Impurities, Sitagliptin

5-desfluoro 3-oxobutanoate methyl ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C11H10F2O3

Mol W.

: 228.19

Cat No.

: SA10440

Impurities, Sitagliptin

5-desfluoro N-Boc Acid Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 851307-12-5

Mol F.

: C15H19F2NO4

Mol W.

: 315.31

Cat No.

: SA10442

Impurities, Sitagliptin

5-Desfluoro Sitagliptin; Sitagliptin EP Impurity C

$295.00 25 mg

In Stock

CAS No.

: 1345822-86-7; 945261-48-3

Mol F.

: C16H16F5N5O

Mol W.

: 389.32

Cat No.

: SA10412

Emtricitabine, Impurities

5-Epi emtricitabine & its enantiomers

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C16H20F2N6O6S2

Mol W.

: 494.49

Cat No.

: SA22930

Emtricitabine, Impurities

5-epi Emtricitabine; Emtricitabine Diasteromer (RRT-1.23)

$295.00 5 mg

In Stock

CAS No.

: 145986-26-1

Mol F.

: C₈H₁₀FN₃O₃S

Mol W.

: 247.25

Cat No.

: SA22901

Impurities, Ticagrelor

5-Nitro-2-(propylthio)pyrimidine-4,6-diol

Please enquire for price & pack size

In Stock

CAS No.

: 145783-13-7

Mol F.

: C7H9N3O4S

Mol W.

: 231.2

Cat No.

: SA32515

Impurities, Rosuvastatin

5-Oxorosuvastatin Methyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 147118-39-6

Mol F.

: C23H28FN3O6S

Mol W.

: 493.55

Cat No.

: SA12147

Impurities, Naratriptan

5‐Ethyl‐3‐(1‐methylpiperidin‐4‐yl)‐1H‐indole

Please enquire for price & pack size

In Stock

CAS No.

: 2074613-76-4

Mol F.

: C16H22N2

Mol W.

: 242.36

Cat No.

: SA30811

Dorzolamide, Impurities

5,6-Dihydro-4-hydroxy-6-methyl-4H-thieno[2,3-b]thiopyran-2-sulfonamide 7,7-Dioxide

$145.00 25 mg

In Stock

CAS No.

: 120279-26-7

Mol F.

: C8H11NO5S3

Mol W.

: 297.37

Cat No.

: SA24111

Dorzolamide, Impurities

5,6-Dihydro-6-methyl-4-oxo-4H-thieno[2,3-b]thiopyran-2-sulfonamide 7,7-Dioxide

$195.00 25 mg

In Stock

CAS No.

: 935289-26-2

Mol F.

: C8H9NO5S3

Mol W.

: 295.36

Cat No.

: SA24112

Impurities, Lamivudine

5’-Epi Lamivudine

Please enquire for price & pack size

In Stock

CAS No.

: 139757-68-9

Mol F.

: C8H11N3O3S

Mol W.

: 229.26

Cat No.

: SA22305

Impurities, Testosterone

6 keto testosterone

Please enquire for price & pack size

In Stock

CAS No.

: 570-94-5

Mol F.

: C19H26O3

Mol W.

: 302.41

Cat No.

: SA16216

Aminocaproic Acid, Impurities

6-Acetamidohexanoic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 57-08-9

Mol F.

: C₈H₁₅NO₃

Mol W.

: 173.21

Cat No.

: SA22605

Impurities, Palbociclib

6-Acetyl-2-amino-8-cyclopentyl-5-methylpyrido[2,3-d]pyrimidin-7(8H)-one

$125.00 25 mg

In Stock

CAS No.

: 571189-64-5

Mol F.

: C15H18N4O2

Mol W.

: 286.3

Cat No.

: SA40417

Impurities, Progesterone

6-Alpha Hydroxy progesterone

Please enquire for price & pack size

In Stock

CAS No.

: 604-20-6

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18012

Difluoroprednisolone, Impurities

6-alpha-Fluoro-isoflupredone; 6α,9α-Difluoroprednisolone

$95.00 25 mg

In Stock

CAS No.

: 806-29-1

Mol F.

: C21H26F2O5

Mol W.

: 396.42

Cat No.

: SA14206

Aminocaproic Acid, Impurities

6-Amino-hexanoic Acid Phenylmethyl Ester 4,4’-Dimethoxybenzhydrol

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C₂₈H₃₃NO₄

Mol W.

: 447.57

Cat No.

: SA22607

Aminocaproic Acid, Impurities

6-Aminohexanoic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 60-32-2

Mol F.

: C₆H₁₃NO₂

Mol W.

: 131.17

Cat No.

: SA22603

Aminocaproic Acid, Impurities

6-Aminohexanoic Acid Cyclized Dimer

Please enquire for price & pack size

In Stock

CAS No.

: 56403-09-9

Mol F.

: C12H22N2O2

Mol W.

: 226.32

Cat No.

: SA22602

Aminocaproic Acid, Impurities

6-Aminohexanoic Acid Dimer Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2014-58-6

Mol F.

: C12H24N2O3

Mol W.

: 244.33

Cat No.

: SA22600

Aminocaproic Acid, Impurities

6-Aminohexanoic Acid Trimer Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 5776-78-3

Mol F.

: C18H35N3O4

Mol W.

: 357.49

Cat No.

: SA22601

Impurities, Progesterone

6-beta Hydroxy progesterone

Please enquire for price & pack size

In Stock

CAS No.

: 604-19-3

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18013

Impurities, Naltrexol

6-Beta naltrexol

Please enquire for price & pack size

In Stock

CAS No.

: 49625-89-0

Mol F.

: C20H25NO4

Mol W.

: 343.42

Cat No.

: SA46701

Impurities, Palbociclib

6-Bromo-2-chloro-8-cyclopentyl-5-methylpyrido-[2,3-d]pyrimidin-7(8H)-one

$90.00 25 mg

In Stock

CAS No.

: 1016636-76-2

Mol F.

: C13H13BrClN3O

Mol W.

: 342.62

Cat No.

: SA40423

Impurities, Lorcaserin

6-Chloro analog

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C11H14ClN

Mol W.

: 195.69

Cat No.

: SA18803

Impurities, Penciclovir

6-Chloro Desacetyl Famciclovir; Penciclovir Impurity F

$195.00 25 mg

In Stock

CAS No.

Mol F.

: C12H16ClN5O3

Mol W.

: 313.74

Cat No.

: SA27702

Impurities, Penciclovir

6-Chloro Didesacetyl Famciclovir; Penciclovir Impurity D

$255.00 25 mg

In Stock

CAS No.

: 172529-94-1

Mol F.

: C10H14ClN5O2

Mol W.

: 271.70

Cat No.

: SA27701

Impurities, Penciclovir

6-Chloro Famciclovir; Penciclovir Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 97845-60-8

Mol F.

: C14H18ClN5O4

Mol W.

: 355.78

Cat No.

: SA27704

Impurities, Tofacitinib

6-Chloro-7-Deazapurine

$90.00 25 mg

In Stock

CAS No.

: 3680-69-1 (Base)

Mol F.

: C6H4ClN3

Mol W.

: 153.57

Cat No.

: SA43321

Hydrocortisone, Impurities

6-Dehydrocortisol Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 21940-45-4

Mol F.

: C23H30O6

Mol W.

: 402.48

Cat No.

: SA15213

Hydrocortisone Valerate, Impurities

6-Dehydrocortisol-17-valerate

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA27305

Impurities, Palbociclib

6-Desacetyl Palbociclib

$115.00 25 mg

In Stock

CAS No.

: 571190-22-2

Mol F.

: C22H27N7O

Mol W.

: 405.5

Cat No.

: SA40414

Impurities, Palbociclib

6-Desacetyl-6-Bromo Palbociclib

$125.00 25 mg

In Stock

CAS No.

: 851067-56-6

Mol F.

: C22H26BrN7O

Mol W.

: 484.39

Cat No.

: SA40413

Etravirine, Impurities

6-Desamino 6-Chloro Etravirine

Please enquire for price & pack size

In Stock

CAS No.

: 269055-76-7

Mol F.

: C20H13BrClN5O

Mol W.

: 454.71

Cat No.

: SA26102

Fluticasone Propionate, Impurities

6-Desfluoro Fluticasone Propionate Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C25H32F2O5S

Mol W.

: 482.58

Cat No.

: SA47030

Exemestane, Impurities

6-Formyl Exemestane

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19125

Exemestane, Impurities

6-Formyl-17α-hydroxy Exemestane Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C20H24O3

Mol W.

: 312.39999999999998

Cat No.

: SA19112

Fluticasone Propionate, Impurities

6-Keto Fluticasone Propionate

$1,000.00 25 mg

In Stock

CAS No.

: 3068810-13-6

Mol F.

: C25H30F2O6S

Mol W.

: 496.564

Cat No.

: SA47029

Fulvestrant, Impurities

6-Keto Fulvestrant; Fulvestrant Impurity F

$500.00 25 mg

In Stock

CAS No.

Mol F.

: C32H45F5O4S

Mol W.

: 620.75

Cat No.

: SA11801

Impurities, Norethindrone

6-Keto Norethindrone; 6-Oxo Norethindrone

Please enquire for price & pack size

In Stock

CAS No.

: 67696-78-0

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA13415

Impurities, Progesterone

6-keto progesterone

Please enquire for price & pack size

In Stock

CAS No.

: 2243-08-5

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA18014

Impurities, Naproxen

6-mehoxy-2-Naphthoic acid Impurity

$75.00 25 mg

In Stock

CAS No.

: 2471-70-7

Mol F.

: C12H10O3

Mol W.

: 202.21

Cat No.

: SA20410

Impurities, Prazosin

6-O-Desmethyl Prazosin

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C18H19N5O4

Mol W.

: 369.37

Cat No.

: SA24207

Estradiol, Impurities

6,7-Dehydro Estradiol

Please enquire for price & pack size

In Stock

CAS No.

: 7291-41-0

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA13203

Impurities, Norethindrone

6,7-Dehydro Norethindrone Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 106765-04-2

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA13403

Difluoroprednisolone, Impurities

6α-9-Difluoroprednisolone-17-Carboxylate

$120.00 10 mg

In Stock

CAS No.

: 1234557-20-0

Mol F.

: C20H24F2O5

Mol W.

: 382.4

Cat No.

: SA14211

Estradiol, Impurities

6α-Hydroxy 17β-Estradiol

Please enquire for price & pack size

In Stock

CAS No.

: 1229-24-9

Mol F.

: C18H24O3

Mol W.

: 288.38

Cat No.

: SA13201

Impurities, Naloxone

6α-Hydroxy Naloxone

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C19H23NO4

Mol W.

: 329.39

Cat No.

: SA45106