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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

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-amino-pyrimidine-5-carboxylate

$200.00 25 mg

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CAS No.

: 712320-67-7

Mol F.

: C16H18FN3O2

Mol W.

: 303.33

Cat No.

: SA12109

Impurities, Rosuvastatin

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-methylthiopyrimidine-5-carboxylate

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CAS No.

: 147118-27-2

Mol F.

: C17H19FN2O2S

Mol W.

: 334.41

Cat No.

: SA12112

Glyburide, Impurities

Ethyl 4-[2-(5-Chloro-2-methoxybenzamido)ethyl]benzene Sulfonamide Carbamate

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CAS No.

: 14511-59-2

Mol F.

: C₁₉H₂₁ClN₂O₆S

Mol W.

: 440.9

Cat No.

: SA12301

Rosuvastatin

ethyl 4-methylbenzenesulfonate

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CAS No.

: 80-40-0

Mol F.

: C9H12O3S

Mol W.

: 200.25

Cat No.

: SA121119

Gabapentin, Impurities

Ethyl Cyanocyclohexylideneacetate

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CAS No.

: 6802-76-2

Mol F.

: C₁₁H₁₅NO₂

Mol W.

: 193.24

Cat No.

: SA22811

Impurities, Leflunomide

Ethyl-2-ethoxymehyledene-3-oxobutonoate | CAS NO : 66975-53-9

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CAS No.

: 66975-53-9

Mol F.

: C9H14O4

Mol W.

: 186.21

Cat No.

: SA21820

Impurities, Leflunomide

Ethyl-5-methyl isoxazole carboxylic acid | CAS NO : 51135-73-0

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CAS No.

: 51135-73-0

Mol F.

: C7H9NO3

Mol W.

: 155.15

Cat No.

: SA21821

Impurities, Nitrosamine

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA44697

Apixaban, Impurities, Nitrosamine

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA39949

Etoricoxib, Impurities

Etoricoxib Bis-Sulfonylphenyl Terpyridine Impurity

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CAS No.

: NA

Mol F.

: C31H27N3O4S2

Mol W.

: 569.69

Cat No.

: SA41608

Etoricoxib, Impurities

Etoricoxib Methylpyridinyl Dimer Impurity

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CAS No.

: 1421227-97-5

Mol F.

: C22H20N2O4S

Mol W.

: 408.48

Cat No.

: SA41609

Etravirine, Impurities

Etravirine

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CAS No.

: 269055-15-4(Base);1030633-38-5(HBrSalt)

Mol F.

: C20H15BrN6O

Mol W.

: 435.28

Cat No.

: SA26100

Etravirine, Impurities

Etravirine 6-Dimer Impurity

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CAS No.

: 1704730-70-0

Mol F.

: C29H21BrN6O2

Mol W.

: 565.41999999999996

Cat No.

: SA26112

Etravirine, Impurities

Etravirine butanamide Impurity

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CAS No.

: 2240161-92-4

Mol F.

: C25H24BrN7O2

Mol W.

: 534.4

Cat No.

: SA26113

Etravirine, Impurities

Etravirine Chloro Impurity

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CAS No.

: 269055-19-8

Mol F.

: C20H15ClN6O

Mol W.

: 390.83

Cat No.

: SA26110

Etravirine, Impurities

Etravirine N-Oxide Impurity

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CAS No.

: 907180-19-2

Mol F.

: C20H15BrN6O2

Mol W.

: 451.28

Cat No.

: SA26108

Exemestane, Impurities

Exemestane

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CAS No.

: 107868-30-4

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19100

Exemestane, Impurities

Exemestane ±β-Spirooxirane

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CAS No.

: NA

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19129

Exemestane, Impurities

Exemestane 3-ethoxy Impurity

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CAS No.

: NA

Mol F.

: C22H32O2

Mol W.

: 328.5

Cat No.

: SA19103

Exemestane, Impurities

Exemestane 6-Hydroxymethyl Impurity

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CAS No.

: 152764-26-6

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19122

Exemestane, Impurities

Exemestane Diol Impurity

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CAS No.

: 184972-11-0

Mol F.

: C₂₀H₂₆O₄

Mol W.

: 330.42

Cat No.

: SA19121

Exemestane

Exemestane EP Impurity B

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CAS No.

: 184972-09-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19127

Exemestane, Impurities

Exemestane EP Impurity C

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CAS No.

: 2130745-60-5

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA19105

Exemestane, Impurities

Exemestane Impurity 24 Mixture

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CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19139

Exemestane, Impurities

Exemestane Related Compound D

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CAS No.

: 2467590-81-2

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA19104

Ezetimibe, Impurities

Ezetimibe 2-Fluoro Impurity

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CAS No.

: 2191318-99-5

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14829

Ezetimibe, Impurities

Ezetimibe 2-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.15

Cat No.

: SA14859

Ezetimibe, Impurities

Ezetimibe 3-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14860

Ezetimibe, Impurities

Ezetimibe Diacid Impurity

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CAS No.

: 1013025-04-1

Mol F.

: C25H24FNO5

Mol W.

: 437.46

Cat No.

: SA14804

Ezetimibe, Impurities

Ezetimibe Diastereomers (R,R,R and S,S,S)

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14852

Ezetimibe, Impurities

Ezetimibe Hydroxy Glucuronide

$995.00 25 mg

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CAS No.

: 536709-33-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14824

Ezetimibe, Impurities

Ezetimibe Lactam Cleaved Alcohol; 3’-Anhydro Ezetimibe Alcohol Impurity

$995.00 25 mg

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CAS No.

: 1374250-07-3

Mol F.

: C24H23F2NO2

Mol W.

: 395.45

Cat No.

: SA14817

Ezetimibe, Impurities

Ezetimibe meta-Fluorobenzene Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14858

Ezetimibe, Impurities

Ezetimibe Phenexy Glucuronide

$950.00 25 mg

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CAS No.

: 190448-57-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14823

Ezetimibe, Impurities

Ezetimibe Triol Impurity

$1,550.00 25 mg

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CAS No.

: 2363086-22-8

Mol F.

: C33H30F2N2OS

Mol W.

: 572.61

Cat No.

: SA14830

Famciclovir, Impurities

Famciclovir

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CAS No.

: 104227-87-4

Mol F.

: C14H19N5O4

Mol W.

: 321.4

Cat No.

: SA48300

Famciclovir, Impurities

Famciclovir 2-hydroxypropane Derivative

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CAS No.

: 172645-79-3

Mol F.

: C14H19N5O5

Mol W.

: 337.3

Cat No.

: SA48319

Famciclovir, Impurities

Famciclovir 3-acetoxy-2-methylpropanoate Impurity

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CAS No.

: NA

Mol F.

: C15H21N5O4

Mol W.

: 335.4

Cat No.

: SA48325

Famciclovir, Impurities

Famciclovir 3-hydroxypropanoate Derivative

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CAS No.

: NA

Mol F.

: C12H17N5O3

Mol W.

: 279.3

Cat No.

: SA48324

Famciclovir, Impurities

Famciclovir 4-hydroxybutyl Impurity

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CAS No.

: 23169-37-1

Mol F.

: C9H13N5O2

Mol W.

: 223.2

Cat No.

: SA48314

Famciclovir, Impurities

Famciclovir 6- Amino Derivative

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CAS No.

: 97845-71-1

Mol F.

: C10H16N6O2

Mol W.

: 252.3

Cat No.

: SA48308

Famciclovir, Impurities

Famciclovir 6- Hydroxy Derivative

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CAS No.

: 234110-22-6

Mol F.

: C10H11N5O5

Mol W.

: 281.3

Cat No.

: SA48313

Famciclovir, Impurities

Famciclovir 6- Methoxy Derivative

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CAS No.

: 97845-65-3

Mol F.

: C10H11N5O5

Mol W.

: 267.3

Cat No.

: SA48312

Famciclovir, Impurities

Famciclovir 6-Alkylamino Impurity

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CAS No.

: NA

Mol F.

: C23H34N6O8

Mol W.

: 522.6

Cat No.

: SA48315

Famciclovir, Impurities

Famciclovir 6-Oxo 4-butyl Acetate Impurity

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CAS No.

: 183475-21-0

Mol F.

: C11H15N5O3

Mol W.

: 265.3

Cat No.

: SA48321

Famciclovir, Impurities

Famciclovir 6-Oxo Desacetyl Dimer Impurity

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CAS No.

: NA

Mol F.

: C20H28N10O5

Mol W.

: 488.5

Cat No.

: SA48320

Famciclovir, Impurities

Famciclovir 6-Oxo, 7-Alkylamino Impurity

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CAS No.

: 127205-22-5

Mol F.

: C10H15N5O3

Mol W.

: 253.3

Cat No.

: SA48316

Famciclovir, Impurities

Famciclovir 7-Acetate Impurity

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CAS No.

: NA

Mol F.

: C16H23N5O5

Mol W.

: 365.4

Cat No.

: SA48323

Famciclovir, Impurities

Famciclovir Ethyl 1,4-Diacetate Derivative

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CAS No.

: 174155-69-2

Mol F.

: C15H21N5O4

Mol W.

: 335.4

Cat No.

: SA48322

Famciclovir, Impurities

Famciclovir Malonate

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CAS No.

: 122497-20-5

Mol F.

: C12H15N5O4

Mol W.

: 293.3

Cat No.

: SA48309