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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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Hydroxyprogesterone Caproate, Impurities

Hydroxyprogesterone Caproate impurity C

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C27H38O4

Mol W.

: 426.59

Cat No.

: SA18202

Hydroxyprogesterone Caproate, Impurities

Hydroxyprogesterone Caproate impurity D

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Limited Stock

CAS No.

: 4596-16-1

Mol F.

: C28H42O4

Mol W.

: 442.63

Cat No.

: SA18203

Impurities, Indacaterol

Indacaterol O-Benzyl Impurity

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Limited Stock

CAS No.

: 435273-75-9

Mol F.

: C31H34N2O3

Mol W.

: 482.61

Cat No.

: SA48705

Impurities, Levonorgestrel

Levonorgestrel EP Impurity G

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Limited Stock

CAS No.

: 87585-03-3

Mol F.

: C₂₁H₂₈O₃

Mol W.

: 328.45

Cat No.

: SA23710

Impurities, Levonorgestrel

Levonorgestrel EP Impurity I

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Limited Stock

CAS No.

: 20402-62-4

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23712

Impurities, Linagliptin

Linagliptin Impurity 4

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C35H36N10O2

Mol W.

: 628.73

Cat No.

: SA49937

Colesevelam, Impurities

Methoxyquat Bromide

$150.00 25 mg

Limited Stock

CAS No.

: 359436-97-8

Mol F.

: C10H24BrNO

Mol W.

: 254.21

Cat No.

: SA10210

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity G

$125.00 25 mg

Limited Stock

CAS No.

: 1625-11-2

Mol F.

: C24H34O6

Mol W.

: 418.52

Cat No.

: SA25006

Impurities, Methylprednisolone

Methylprednisolone EP Impurity B

$125.00 25 mg

Limited Stock

CAS No.

: 58636-50-3

Mol F.

: C22H30O6

Mol W.

: 390.47

Cat No.

: SA14405

Impurities, Methylprednisolone

Methylprednisolone EP Impurity F

$125.00 25 mg

Limited Stock

CAS No.

: 1625-39-4

Mol F.

: C22H32O5

Mol W.

: 376.49

Cat No.

: SA14407

Impurities, Midazolam

Midazolam EP Impurity J

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Limited Stock

CAS No.

: 59469-08-8

Mol F.

: C18H17ClFN3

Mol W.

: 329.8

Cat No.

: SA44302

Impurities, Milnacipran

Milnacipran EP Impurity D

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Limited Stock

CAS No.

: 60788-55-8

Mol F.

: C11H11NO

Mol W.

: 173.21

Cat No.

: SA24303

Impurities, Mometasone

Mometasone EP Impurity M

$295.00 25 mg

Limited Stock

CAS No.

: 57780-86-6

Mol F.

: C22H29ClO4

Mol W.

: 392.91

Cat No.

: SA28716

Impurities, Mometasone

Mometasone Furoate EP Impurity E

$295.00 25 mg

Limited Stock

CAS No.

: 1370190-33-2

Mol F.

: C₃₂H₃₂Cl₂O₈

Mol W.

: 615.5

Cat No.

: SA28705

Impurities, Mometasone

Mometasone Furoate EP Impurity I

$595.00 25 mg

Limited Stock

CAS No.

Mol F.

: C29H34Cl2O8

Mol W.

: 581.48

Cat No.

: SA28709

Impurities, Linezolid

N-(3-(3-fluoro-4-morpholinophenylamino)propyl)-N-(((S)-3-(3-fluoro-4-morpholionphenyl)-2-oxo-5-oxazolidinyl) methyl)amine

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Limited Stock

CAS No.

Mol F.

: C27H35F2N5O4

Mol W.

: 531.59

Cat No.

: SA17504

Cinacalcet, Impurities

N-(4-Benzyl trifluoromethyl) Cinacalcet Impurities

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Limited Stock

CAS No.

: NA

Mol F.

: C20H18F3N

Mol W.

: 329.36

Cat No.

: SA34214

Impurities, Linezolid

N-acetyl-(3-(3-fluoro-4-morpholinophenylamino)propyl)-N-(((S)3-(3-fluoro-4-morpholionphenyl)-2-oxo-5-oxazolidinyl) methyl)acetamide

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Limited Stock

CAS No.

Mol F.

: C31H39F2N5O6

Mol W.

: 615.67

Cat No.

: SA17503

Cabergoline, Impurities, Nitrosamine

N-Desallyl-N-Nitroso Cabergoline Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C23H32N6O3

Mol W.

: 440.54

Cat No.

: SA51803

Impurities, Sitagliptin

N,N’-(ethane-1,2-diyl)bis(3-amino-4-(2,4,5-trifluorophenyl)butanamide)dihydrochloride

$395.00 25 mg

Limited Stock

CAS No.

Mol F.

: C22H26Cl2F6N4O2

Mol W.

: 563.39

Cat No.

: SA10450

Impurities, Naproxen

Naproxen EP Impurity A

$125.00 25 mg

Limited Stock

CAS No.

: 52079-10-4

Mol F.

: C13H12O3

Mol W.

: 216.24

Cat No.

: SA20401

Impurities, Nebivolol

Nebivolol Desfluoro

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Limited Stock

CAS No.

: 129101-34-4

Mol F.

: C22H26FNO4

Mol W.

: 387.44

Cat No.

: SA14701

Impurities, Nizatidine

Nizatidine EP Impurity D

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Limited Stock

CAS No.

: 78441-62-0

Mol F.

: C9H17N3S2

Mol W.

: 231.38

Cat No.

: SA34404

Impurities, Naloxone

Noroxymorphone

Please enquire for price & pack size

Limited Stock

CAS No.

: 33522-95-1

Mol F.

: C16H17NO4

Mol W.

: 287.31

Cat No.

: SA45111

Impurities, Naloxone

O-Propyl Naloxone Enol Ether

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Limited Stock

CAS No.

: NA

Mol F.

: C22H27NO4

Mol W.

: 369.45

Cat No.

: SA45102

Impurities, Olmesartan Medoxomil

OMJ2 ethyl methyl impurity

$295.00 25 mg

Limited Stock

CAS No.

Mol F.

: C49H46N6O6

Mol W.

: 814.92

Cat No.

: SA17708

Impurities, Olmesartan Medoxomil

OMJ2 ethyl methyl impurity (N2)

$295.00 25 mg

Limited Stock

CAS No.

Mol F.

: C49H46N₆O₆

Mol W.

: 814.92

Cat No.

: SA17709

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity G

$295.00 25 mg

Limited Stock

CAS No.

: 15882-79-8

Mol F.

: C17H17N

Mol W.

: 251.32

Cat No.

: SA12510

Impurities, Pemetrexed

Pemetrexed EP impurity B & C mixture (1:1)

Please enquire for price & pack size

Limited Stock

CAS No.

: 1644286-34-9

Mol F.

: C40H40N10O13

Mol W.

: 868.82

Cat No.

: SA32322

Impurities, Prazosin

Prazosin EP Impurity E

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Limited Stock

CAS No.

: 102839-00-9

Mol F.

: C24H28N8O4

Mol W.

: 492.53

Cat No.

: SA24204

Impurities, Prednisolone

Prednisolone EP Impurity J

$395.00 25 mg

Limited Stock

CAS No.

: 1807-14-3

Mol F.

: C21H28O4

Mol W.

: 344.45

Cat No.

: SA16709

Impurities, Prochlorperazine Maleate

Prochlorperazine Maleate Degradant V

Please enquire for price & pack size

Limited Stock

CAS No.

: 58-38-8

Mol F.

: C20H24ClN3OS

Mol W.

: 389.94

Cat No.

: SA45602

Impurities, Prochlorperazine Maleate

Prochlorperazine Related Compound A

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Limited Stock

CAS No.

: 1346602-34-3

Mol F.

: C20H24ClN3S

Mol W.

: 373.94

Cat No.

: SA45603

Impurities, Progesterone

Progesterone EP Impurity G

Please enquire for price & pack size

Limited Stock

CAS No.

: 2257421-79-5

Mol F.

: C27H38O2

Mol W.

: 394.59

Cat No.

: SA18005

Abacavir, Impurities

Pyrimidine Dimer Derivative

$595.00 25 mg

Limited Stock

CAS No.

Mol F.

: C16H17ClN9O3

Mol W.

: 454.27

Cat No.

: SA18122

Impurities, Raloxifene

Raloxifene N-Oxide

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Limited Stock

CAS No.

: 195454-31-0

Mol F.

: C28H27NO5S

Mol W.

: 489.58

Cat No.

: SA24907

Impurities, Rilpivirine

Rilpivirine N-Oxide

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C22H18N6O

Mol W.

: 382.42

Cat No.

: SA25400

Rivaroxaban

Rivaroxaban Dioxazolidine Impurity | CAS : 2809182-22-5

$550.00 25 mg

Limited Stock

CAS No.

: 2809182-22-5

Mol F.

: C₂₈H₃₁N₅O₈

Mol W.

: 565.57

Cat No.

: SA18616

Rivaroxaban

Rivaroxaban Enantiomer (R-Isomer)

$100.00 25 mg

Limited Stock

CAS No.

: 865479-71-6

Mol F.

: C19H18ClN3O5S

Mol W.

: 435.88

Cat No.

: SA18601

Impurities, Rosuvastatin

Rosuvastatin (6S)-Lactone Impurity

$650.00 25 mg

Limited Stock

CAS No.

: 854898-47-8

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA12182

Impurities, Rosuvastatin

Rosuvastatin EP Impurity F Z-isomer

$250.00 25 mg

Limited Stock

CAS No.

: 1821422-50-7

Mol F.

: C29H40FN3O6S

Mol W.

: 577.71

Cat No.

: SA121116

Fulvestrant, Impurities

S-Deoxo-3,17-bis-(O-tetrahydro-2H-pyran-2-yl)-6-hydroxy-fulvestrant

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C42H63F5O5S

Mol W.

: 775

Cat No.

: SA11807

Salbutamol

Salbutamol EP Impurity D; Albuterol Aldehyde

Please enquire for price & pack size

Limited Stock

CAS No.

: 156339-88-7

Mol F.

: C13H19NO3

Mol W.

: 237.29

Cat No.

: SA26003

Impurities, Saxagliptin

Saxagliptin Imine Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 1350800-76-8

Mol F.

: C18H25N3O2

Mol W.

: 315.41

Cat No.

: SA27405

Impurities, Saxagliptin

Saxagliptin N-Acetate Impurity

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Limited Stock

CAS No.

: NA

Mol F.

: C20H27N3O3

Mol W.

: 357.45

Cat No.

: SA27406

Impurities, Sulpiride

Sulpiride EP impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 33045-52-2

Mol F.

: C9H11NO5S

Mol W.

: 245.26

Cat No.

: SA10902

Impurities, Telmisartan

Telmisartan Bromo Amide

Please enquire for price & pack size

Limited Stock

CAS No.

: 147404-72-6

Mol F.

: C14H12BrNO

Mol W.

: 289.01

Cat No.

: SA33910

Impurities, Tenofovir

Tenofovir Disoproxil Fumarate IP Impurity D

$295.00 25 mg

Limited Stock

CAS No.

: 1422284-15-8

Mol F.

: C21H32N5O11P

Mol W.

: 561.48

Cat No.

: SA36904

Impurities, Testosterone

Testosterone EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 972-46-3

Mol F.

: C21H30O2

Mol W.

: 314.5

Cat No.

: SA16204

Impurities, Testosterone

Testosterone EP Impurity J

Please enquire for price & pack size

Limited Stock

CAS No.

: 57144-06-6

Mol F.

: C20H28O2

Mol W.

: 300.44

Cat No.

: SA16212