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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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Cetirizine, Impurities

Cetirizine N-Methyl Piperazine Impurity

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CAS No.

Mol F.

: C18H21ClN2

Mol W.

: 300.83

Cat No.

: SA13515

Cetirizine, Impurities

Cetrizine N-Oxide

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CAS No.

: 1076199-80-8

Mol F.

: C21H25ClN2O4

Mol W.

: 404.89

Cat No.

: SA13503

Efavirenz, Impurities

Chloro Cyclopropyl Efavirenz

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CAS No.

: 1322625-98-8

Mol F.

: C₁₄H₈Cl₂F₃NO₂

Mol W.

: 350.12

Cat No.

: SA17617

Aciclovir, Impurities

Chloroacetic Acid

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CAS No.

: 79-11-8

Mol F.

: C2H3ClO0

Mol W.

: 94.05

Cat No.

: SA21400

Diphenhydramine, Impurities

Chlorodiphenylmethane

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CAS No.

: 90-99-3

Mol F.

: C13H11Cl

Mol W.

: 202.68

Cat No.

: SA19805

Tenofovir

Chloromethyl Isopropyl Carbonate

$175.00 1 g

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CAS No.

: 35180-01-9

Mol F.

: C5H9ClO3

Mol W.

: 152.58

Cat No.

: SA36922

Apixaban, Impurities

Chloropentanamide Apixaban Impurity

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CAS No.

: 1449510-64-8

Mol F.

: C25H26ClN5O4

Mol W.

: 495.96

Cat No.

: SA39916

Baclofen, Impurities

Chlorophenyl glutaric Acid

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CAS No.

: 35271-74-0

Mol F.

: C11H11ClO4

Mol W.

: 242.65

Cat No.

: SA28104

Hydroxychloroquine, Impurities

Chloroquine related compound A

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CAS No.

: 86-98-6

Mol F.

: C9H5Cl2N

Mol W.

: 198.05

Cat No.

: SA23804

Clomifene, Impurities

Chlorostilbene

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CAS No.

: 948-99-2

Mol F.

: C14H11Cl

Mol W.

: 214.69

Cat No.

: SA21706

Chlorpheniramine, Impurities

Chlorphenamine; Chlorpheniramine

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CAS No.

: 132-22-9

Mol F.

: C16H19ClN2

Mol W.

: 274.79

Cat No.

: SA37600

Chlorpheniramine, Impurities

Chlorpheniramine Didesmethyl Impurity

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CAS No.

: 23052-94-0

Mol F.

: C14H15ClN2

Mol W.

: 246.73

Cat No.

: SA37601

Chlorpheniramine, Impurities

Chlorpheniramine N-Oxide Dihydrochloride Impurity

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CAS No.

: 120244-82-8 (HCl); 120244-82-8 (base)

Mol F.

: C16H19ClN2O

Mol W.

: 290.79

Cat No.

: SA37603

Chlorpheniramine, Impurities

Chlorpheniramine Nitrile Impurity

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CAS No.

: 65676-21-3

Mol F.

: C17H18ClN3

Mol W.

: 299.8

Cat No.

: SA37602

Chlorpheniramine, Impurities

Chlorpheniramine USP RC B

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CAS No.

: 1202-34-2

Mol F.

: C10H9N3

Mol W.

: 171.2

Cat No.

: SA37604

Chlorpheniramine

Chlorpheniramine USP RC C

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CAS No.

: 20619-12-9 (free base)

Mol F.

: C15H17ClN2

Mol W.

: 260.76

Cat No.

: SA37609

Chlorpromazine, Impurities

Chlorpromazine 7-Hydroxy Impurity

$795.00 50 mg

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CAS No.

: 51938-11-5

Mol F.

: C17H19ClN2OS

Mol W.

: 334.86

Cat No.

: SA21611

Chlorpromazine, Impurities

Chlorpromazine EP Impurity F

$355.00 25 mg

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CAS No.

: 72372-62-4 (HCl); 13094-24-1 (base)

Mol F.

: C17H19ClN2S

Mol W.

: 318.87

Cat No.

: SA21610

Chlorthalidone, Impurities

Chlorthalidone

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CAS No.

: 77-36-1

Mol F.

: C₁₄H₁₁ClN₂O₄S

Mol W.

: 338.77

Cat No.

: SA22411

Chlorthalidone, Impurities

Chlorthalidone Benzenesulfonamide Dimer Impurity

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CAS No.

: NA

Mol F.

: C28H19Cl2N3O6S2

Mol W.

: 628.50

Cat No.

: SA22412

Chlorthalidone, Impurities

Chlorthalidone Impurity F

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CAS No.

: 1796929-84-4

Mol F.

: C28H19Cl2N3O8S2

Mol W.

: 660.5

Cat No.

: SA22405

Ciclesonide, Impurities

Ciclesonide

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CAS No.

: 126544-47-6

Mol F.

: C32H44O7

Mol W.

: 540.69

Cat No.

: SA49100

Ciclesonide, Impurities

Ciclesonide 21-Cyclohexanoyl Analog

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CAS No.

: 1005416-98-7

Mol F.

: C35H48O7

Mol W.

: 580.75

Cat No.

: SA49104

Ciclesonide, Impurities

Ciclesonide EP Impurity C

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CAS No.

Mol F.

: C32H44O7

Mol W.

: 538.7

Cat No.

: SA49103

Cinacalcet, Impurities

Cinacalcet

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CAS No.

: 226256-56-0

Mol F.

: C₂₂H₂₂F₃N

Mol W.

: 357.41

Cat No.

: SA34200

Cinacalcet, Impurities

Cinacalcet 5,6-Dihydro Racemate Base

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CAS No.

: 802918-47-4

Mol F.

: C22H24F3N

Mol W.

: 359.43

Cat No.

: SA34204

Cinacalcet, Impurities

Cinacalcet 7,8-Dihydro Racemate Base

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CAS No.

: 802918-46-3

Mol F.

: C₂₂H₂₅ClF₃N

Mol W.

: 395.89

Cat No.

: SA34205

Cinacalcet, Impurities

Cinacalcet B Impurity

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CAS No.

: 66469-40-7

Mol F.

: C19H19N

Mol W.

: 261.36

Cat No.

: SA34208

Cinacalcet, Impurities

Cinacalcet C Impurity

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CAS No.

: 955373-56-5

Mol F.

: C22H21ClF3N

Mol W.

: 391.86

Cat No.

: SA34209

Cinacalcet, Impurities

Cinacalcet E Impurity

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CAS No.

: 253337-60-9

Mol F.

: C22H26ClN

Mol W.

: 339.9

Cat No.

: SA34211

Cinacalcet, Impurities

Cinacalcet F Impurity

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CAS No.

: 1271930-12-1

Mol F.

: C22H29ClF3N

Mol W.

: 399.92

Cat No.

: SA34212

Cinacalcet, Impurities

Cinacalcet N-Oxide Impurity

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CAS No.

: 1229224-94-5

Mol F.

: C22H22F3NO

Mol W.

: 373.41

Cat No.

: SA34213

Cinnarizine, Impurities

Cinnarizine

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CAS No.

: 298-57-7

Mol F.

: C₂₆H₂₈N₂

Mol W.

: 368.51

Cat No.

: SA12400

Cinnarizine, Impurities

Cinnarizine EP Impurity A

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CAS No.

: 841-77-0

Mol F.

: C17H20N2

Mol W.

: 252.35

Cat No.

: SA12401

Cinnarizine

Cinnarizine EP Impurity B

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CAS No.

: 750512-44-8

Mol F.

: C₂₆H₂₈N₂

Mol W.

: 368.51

Cat No.

: SA12403

Cinnarizine, Impurities

Cinnarizine EP Impurity C

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CAS No.

: 95062-18-3

Mol F.

: C35H37CIN2

Mol W.

: 521.13

Cat No.

: SA12404

Cinnarizine, Impurities

Cinnarizine EP Impurity D

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CAS No.

: 1199751-98-8

Mol F.

: C35H36N2

Mol W.

: 484.67

Cat No.

: SA12405

Ciprofloxacin, Impurities

Ciprofloxacin

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CAS No.

: 85721-33-1

Mol F.

: C17H18FN3O3

Mol W.

: 331.4

Cat No.

: SA42000

Ciprofloxacin, Impurities

Ciprofloxacin

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CAS No.

: 85721-33-1; 93107-08-5 (HCl salt)

Mol F.

: C17H18FN3O3

Mol W.

: 331.34

Cat No.

: SA34700

Ciprofloxacin, Impurities

Ciprofloxacin 6-Methoxy impurity

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CAS No.

: NA

Mol F.

: C18H21N3O4

Mol W.

: 343.38

Cat No.

: SA34708

Ciprofloxacin, Impurities

Ciprofloxacin 7-Chloro-6-Desethylene Impurity

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CAS No.

: 528851-30-1; 528851-85-6 (free base)

Mol F.

: C15H17ClFN3O3

Mol W.

: 341.77

Cat No.

: SA34711

Ciprofloxacin, Impurities

Ciprofloxacin Difluoro 8-Methoxy Impurity

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CAS No.

: 112811-72-0

Mol F.

: C14H11F2NO4

Mol W.

: 295.24

Cat No.

: SA34712

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity A

$75.00 25 mg

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CAS No.

: 86393-33-1

Mol F.

: C13H9ClFNO3

Mol W.

: 281.67

Cat No.

: SA34701

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity A

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CAS No.

: 86393-33-1

Mol F.

: C13H9ClFNO3

Mol W.

: 281.67

Cat No.

: SA42001

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity B

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CAS No.

: NA

Mol F.

: C18H21N3O3

Mol W.

: 327.38

Cat No.

: SA42003

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity B

$145.00 25 mg

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CAS No.

: 93107-11-0

Mol F.

: C17H20ClN3O3

Mol W.

: 349.81

Cat No.

: SA34702

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity C

$155.00 25 mg

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CAS No.

: 103222-12-4; 528851-31-2 (HCl)

Mol F.

: C15H16FN3O3

Mol W.

: 305.3

Cat No.

: SA34703

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity C

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CAS No.

: 528851-31-2

Mol F.

: C15H16FN3O

Mol W.

: 305.3

Cat No.

: SA42002

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity D

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CAS No.

: NA

Mol F.

: C17H18ClN3O3

Mol W.

: 347.79

Cat No.

: SA42004

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity D

$255.00 25 mg

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CAS No.

: 133210-96-5; 526204-10-4 (HCl salt)

Mol F.

: C17H18ClN3O3

Mol W.

: 347.8

Cat No.

: SA34704