Impurities are undesirable chemical components that remain in the active pharmaceutical ingredient during formulation. Impurities may reduce a product's efficacy.

CAS Number
651770-09-1(free base); 1312366-79-2 (Ca salt); 131275-93-9 (Na salt)
CAS Number
1789703-37-2(Free base)
Alternate CAS Number
2663700-61-4(HCl Salt)