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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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Impurities, Rosuvastatin

5-Methyl Formate De(3,5-dihydroxyhept-6-enoate) Rosuvastatin

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CAS No.

: 371775-70-1

Mol F.

: C16H18FN3O4S

Mol W.

: 367.4

Cat No.

: SA12145

Impurities, Rosuvastatin

5-methyl-1,3,4-thiadiazol-2-ol

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CAS No.

: 84352-65-8

Mol F.

: C3H4N2OS

Mol W.

: 116.14

Cat No.

: SA121123

Impurities, Pregabalin

5-Methyl-2-hex-2-enoic Acid Methyl Ester

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CAS No.

: 68797-67-1

Mol F.

: C8H14O2

Mol W.

: 142.19999999999999

Cat No.

: SA24838

Impurities, Pregabalin

5-Methyl-3-(nitromethyl)-4-hexenoic Acid Ethyl Ester

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CAS No.

: 1136478-28-8

Mol F.

: C10H17NO4

Mol W.

: 215.25

Cat No.

: SA24808

Impurities, Pregabalin

5-Methyl-3-(nitromethyl)hexanoic Acid Ethyl Ester

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CAS No.

: 128013-65-0

Mol F.

: C10H19NO4

Mol W.

: 217.26

Cat No.

: SA24806

Impurities, Leflunomide

5-Methylisoxazole-3-carboxylic Acid

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CAS No.

: 3405-77-4

Mol F.

: C5H5NO3

Mol W.

: 127.1

Cat No.

: SA21815

Impurities, Nitrofurantoin

5-Nitro-2-furaldehyde

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CAS No.

: 698-63-5

Mol F.

: C5H3NO4

Mol W.

: 141.08

Cat No.

: SA39809

Impurities, Nitrofurantoin

5-Nitro-2-furfuraldazine

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CAS No.

: 112537-96-9

Mol F.

: C€H†N„O†

Mol W.

: 278.18

Cat No.

: SA39811

Impurities, Nitrofurantoin

5-Nitrofuraldehyde Diacetate

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CAS No.

: 92-55-7

Mol F.

: C9H9NO7

Mol W.

: 243.17

Cat No.

: SA39810

Impurities, Niacin

5-Nitronicotinic acid

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CAS No.

: 2047-49-6

Mol F.

: C6H4N2O4

Mol W.

: 168.11

Cat No.

: SA33105

Donepezil, Impurities

5-O-Desmethyl Donepezil Impurity

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CAS No.

: 120013-57-2

Mol F.

: C23H27NO3

Mol W.

: 365.47

Cat No.

: SA34303

Impurities, Sulpiride

5-Sulphamoylsalicylic Acid

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CAS No.

: 5378-41-6

Mol F.

: C7H7NO5S

Mol W.

: 217.2

Cat No.

: SA10909

Impurities, Sulpiride

5-Sulphosalicylic Acid

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CAS No.

: 97-05-2

Mol F.

: C7H6O6S

Mol W.

: 218.19

Cat No.

: SA10910

Dapagliflozin, Impurities

5-Vinyl Dapagliflozin Analog

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CAS No.

: NA

Mol F.

: C22H25ClO5

Mol W.

: 404.88

Cat No.

: SA15090

Indacaterol

5,6-Diethyl-2,3-dihydro-1H-inden-2-amine

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CAS No.

: 312753-70-1

Mol F.

: C13H19N

Mol W.

: 189.3

Cat No.

: SA48711

Impurities, Midazolam

5,6-Dihydro Midazolam

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CAS No.

: 59468-07-4

Mol F.

: C18H15ClFN3

Mol W.

: 327.8

Cat No.

: SA44308

Impurities, Isoquinoline

5,7-dimethoxy-3,4-dihydroisoquinoline

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CAS No.

: 610261-08-0;29969-25-3(HClsalt)

Mol F.

: C11H13NO2

Mol W.

: 191.23

Cat No.

: SA19309

Impurities, Rosuvastatin

5’-O-tert-Butyldimethylsilyl Rosuvastatin Lactone

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CAS No.

: 1246832-82-5

Mol F.

: C28H40FN3O5SSi

Mol W.

: 577.78

Cat No.

: SA12133

Dutasteride, Impurities

5(10) dehydro 17-carboxamide Dutasteride

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CAS No.

: NA

Mol F.

: C18H24N2O2

Mol W.

: 300.39

Cat No.

: SA35212

Dutasteride, Impurities

5(10) dehydro Dutasteride

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CAS No.

: 1365545-48-7

Mol F.

: C26H26F6N2O2

Mol W.

: 512.49

Cat No.

: SA35211

Azacitidine, Impurities

5′-Uridylic Acid

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CAS No.

: 58-97-9

Mol F.

: C9H13N2O9P

Mol W.

: 324.18

Cat No.

: SA37507

Carbamazepine, Impurities

5H-Dibenz[b,f]azepin-2-ol

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CAS No.

: 81861-18-9

Mol F.

: C14H11NO

Mol W.

: 209.24

Cat No.

: SA20337

Exemestane, Impurities

5β-Androstan-3α,6β-diol-17-one

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CAS No.

: 14895-71-7

Mol F.

: C19H30O3

Mol W.

: 306.44

Cat No.

: SA19136

Bupropion, Impurities

6-(3-Chlorophenyl)-6-hydroxy-5-methyl-3-thiomorpholine Carboxylic Acid (Mixture of Diastereomers)

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CAS No.

Mol F.

: C12H12ClNO4S

Mol W.

: 301.75

Cat No.

: SA12219

Impurities, Riociguat

6-Amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-7,9-dimethyl-7,9-dihydro-8H-purin-8-one

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CAS No.

: 1361569-23-4

Mol F.

: C20H17FN8O

Mol W.

: 404.4

Cat No.

: SA50822

Impurities, Vericiguat

6-Amino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-7,9-dihydro-8H-purin-8-one

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CAS No.

Mol F.

: C18H12F2N8O

Mol W.

: 394.3

Cat No.

: SA50711

Impurities, Riociguat

6-Amino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-7,9-dihydro-8H-purin-8-one

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CAS No.

: 1361569-10-9

Mol F.

: C18H13FN8O

Mol W.

: 376.4

Cat No.

: SA50820

Aminocaproic Acid, Impurities

6-Aminocaproic Acid Benzyl Ester

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CAS No.

: 5515-01-5(base);5515-00-4(HCl)

Mol F.

: C₁₃H₁₉NO₂

Mol W.

: 221.3

Cat No.

: SA22606

Building Blocks, Impurities

6-Aminoisoquinoline | CAS : 23687-26-5

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CAS No.

: 23687-26-5

Mol F.

: C9H8N2

Mol W.

: 144.17

Cat No.

: SB10711

Impurities, Ketorolac

6-Benzoyl 1-Acetyloxy Methyl Ester Ketorolac

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CAS No.

: NA

Mol F.

: C18H17NO5

Mol W.

: 327.33

Cat No.

: SA36119

Impurities, Ketorolac

6-Benzoyl Ethyl Ester Ketorolac Impurity

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CAS No.

: 2514847-58-4

Mol F.

: C17H17NO3

Mol W.

: 283.32

Cat No.

: SA36118

Ciprofloxacin, Impurities

6-Benzyloxy Benzyl Ester Ciprofloxacin

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CAS No.

: 1391053-23-8

Mol F.

: C27H22FNO4

Mol W.

: 443.47

Cat No.

: SA42010

Hydrocortisone, Impurities

6-beta-Hydroxycortisol Sulfate

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CAS No.

: 53587-06-7

Mol F.

: C₂₁H₃₀O₉S

Mol W.

: 458.52

Cat No.

: SA15215

Impurities, Palbociclib

6-Bromo-8-cyclopentyl-5-methyl-Pyrido[2,3-d]pyrimidine-2,7(1H,8H)-dione

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CAS No.

: 1922954-32-2

Mol F.

: C13H14BrN3O

Mol W.

: 324.17

Cat No.

: SA40429

Aciclovir, Impurities

6-Chloro Aciclovir Acetate

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CAS No.

: 81777-48-2

Mol F.

: C10H12ClH5O3

Mol W.

: 285.69

Cat No.

: SA21425

Diflorasone Acetate, Impurities

6-chloro halobetasol propionate

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CAS No.

: NA

Mol F.

: C25H31Cl2FO5

Mol W.

: 501.4

Cat No.

: SA44409

Impurities, Uracil

6-Chloro-1,3-dimethyluracil

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CAS No.

: 6972-27-6

Mol F.

: C6H7ClN2O2

Mol W.

: 174.58

Cat No.

: SA45304

Impurities, Uracil

6-Chlorouracil

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CAS No.

: 4270-27-3

Mol F.

: C4H3ClN2O2

Mol W.

: 146.53

Cat No.

: SA45303

Impurities, Norethindrone

6-Dehydro-6-acetoxy Norethindrone Acetate

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CAS No.

Mol F.

: C24H28O5

Mol W.

: 396.48

Cat No.

: SA13429

Dapagliflozin, Impurities

6-Deoxy Ethoxyphenoxy Dapagliflozin Analog

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CAS No.

: NA

Mol F.

: C22H27ClO6

Mol W.

: 422.9

Cat No.

: SA15097

Impurities, Penciclovir

6-Deoxypenciclovir Impurity

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CAS No.

: 104227-86-3 (Base); 246021-75-0 (HCl)

Mol F.

: C10H15N5O2

Mol W.

: 237.26

Cat No.

: SA27708

Impurities, Palbociclib

6-Desacetyl-6-bromo-N-Boc Palbociclib

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CAS No.

: 571188-82-4

Mol F.

: C‚‡Hƒ„BrN‡Oƒ

Mol W.

: 584.51

Cat No.

: SA40410

Etravirine, Impurities

6-Desamino 5-Desbromo 6-Chloro Etravirin

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CAS No.

: 1070377-34-2

Mol F.

: C20H14ClN5O

Mol W.

: 375.81

Cat No.

: SA26105

Empagliflozin, Impurities

6-DiTHF Empagliflozin impurity

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CAS No.

Mol F.

: C27H33ClO8

Mol W.

: 521

Cat No.

: SA15132

Impurities, Risperidone

6-fluoro-3-(1-nitrosopiperidin-4-yl)benzo[d]isoxazole

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CAS No.

: 2416230-38-9

Mol F.

: C12H12FN3O2

Mol W.

: 249.24

Cat No.

: SA26323

Halcinonide, Impurities

6-Hydroxy 11-keto Halcinonide

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CAS No.

: NA

Mol F.

: C24H30ClFO6

Mol W.

: 468.94

Cat No.

: SA30408

Exemestane, Impurities

6-Hydroxy-6-(methoxymethyl)-androsta-1,4-diene-3,17-dione

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CAS No.

: NA

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA19108

Impurities, Pregabalin

6-Hydroxy-pregabalin Hydrochloride Diastereomer Mixture

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CAS No.

: 1824424-61-4(freebase)

Mol F.

: C8H17NO3.HCl

Mol W.

: 211.68

Cat No.

: SA24814

Impurities, Niacin

6-Hydroxynicotinic acid

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CAS No.

: 5006-66-6

Mol F.

: C6H5NO3

Mol W.

: 139.11000000000001

Cat No.

: SA33101

Estradiol, Impurities

6-Keto 17β-Estradiol

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CAS No.

: 571-92-6

Mol F.

: C₁₈H₂₂O₃

Mol W.

: 286.37

Cat No.

: SA13205

Impurities

Impurities, Rosuvastatin

5-Methyl Formate De(3,5-dihydroxyhept-6-enoate) Rosuvastatin

CAS No.

: 371775-70-1

Mol F.

: C16H18FN3O4S

Mol W.

: 367.4

Cat No.

: SA12145

Impurities, Rosuvastatin

5-methyl-1,3,4-thiadiazol-2-ol

CAS No.

: 84352-65-8

Mol F.

: C3H4N2OS

Mol W.

: 116.14

Cat No.

: SA121123

Impurities, Pregabalin

5-Methyl-2-hex-2-enoic Acid Methyl Ester

CAS No.

: 68797-67-1

Mol F.

: C8H14O2

Mol W.

: 142.19999999999999

Cat No.

: SA24838

Impurities, Pregabalin

5-Methyl-3-(nitromethyl)-4-hexenoic Acid Ethyl Ester

CAS No.

: 1136478-28-8

Mol F.

: C10H17NO4

Mol W.

: 215.25

Cat No.

: SA24808

Impurities, Pregabalin

5-Methyl-3-(nitromethyl)hexanoic Acid Ethyl Ester

CAS No.

: 128013-65-0

Mol F.

: C10H19NO4

Mol W.

: 217.26

Cat No.

: SA24806

Impurities, Leflunomide

5-Methylisoxazole-3-carboxylic Acid

CAS No.

: 3405-77-4

Mol F.

: C5H5NO3

Mol W.

: 127.1

Cat No.

: SA21815

Impurities, Nitrofurantoin

5-Nitro-2-furaldehyde

CAS No.

: 698-63-5

Mol F.

: C5H3NO4

Mol W.

: 141.08

Cat No.

: SA39809

Impurities, Nitrofurantoin

5-Nitro-2-furfuraldazine

CAS No.

: 112537-96-9

Mol F.

: C€H†N„O†

Mol W.

: 278.18

Cat No.

: C€H†N„O†