Pharmaceutical Impurity Standards & Reference Standards

Browse our full catalog of pharmaceutical impurities, reference materials, and research chemicals.

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Impurity Standards

Eszopiclone Impurity B

CAT No.-
CAS No.43200-81-3
Mol. F.C11H7ClN4O2
Mol. W.262.66
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Isotope Labelled Compounds

Eszopiclone-d8

CAT No.-
CAS No.1093385-24-0
Mol. F.C17H9ClN6O3D8
Mol. W.396.86
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ZOPICLONE

Eszopiclone (S-Zopiclone)

CAT No.-
CAS No.138729-47-2
Mol. F.C17H17ClN6O3
Mol. W.388.81
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Impurity Standards

Ergocalciferol Impurity 2 (Mixture ofDiastereomers)

CAT No.-
CAS No.-
Mol. F.C28H42O
Mol. W.394.64
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Impurity Standards

Ergocalciferol EP Impurity F

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CAS No.-
Mol. F.C28H42O
Mol. W.394.65
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Impurity Standards

Ergocalciferol (Vitamin D2) EP Impurity A (5,6-trans-Vitamin D2)

CAT No.-
CAS No.51744-66-2
Mol. F.C28H44O
Mol. W.396.66
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Impurity Standards

Ergocalciferol (Vitamin D2) Impurity 1 (WindausKetone)

CAT No.-
CAS No.55812-80-1
Mol. F.55812-80-1
Mol. W.276.47
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Impurity Standards

Ergocalciferol EP Impurity B (Ergosterol)

CAT No.-
CAS No.-
Mol. F.C28H44O
Mol. W.396.66
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Impurity Standards

Ergocalciferol EP Impurity C (Lumisterol)

CAT No.-
CAS No.-
Mol. F.C28H44O
Mol. W.396.66
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Impurity Standards

Ergocalciferol EP Impurity D (iso-Tachysterol)

CAT No.-
CAS No.-
Mol. F.C28H44O
Mol. W.396.66
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