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

CAS Number
6216-38-2
Alternate CAS Number
52049-70-4(DiHCl Salt)
CAS Number
26631-90-3
Alternate CAS Number
4027-64-9(K Salt);73335-78-1(Sodium - Salt)