Product Name: Acyclovir Synonyms: Aciclovir; Acyclovir base, Acycloguanosine Chemical Name: 9-((2-hydroxyethoxy)methyl)guanine; 2-Amino-1,9-dihydro-9-[(2-hydroxyethoxy)methyl]-6H-purin-6-one CAS No.: 59277-89-3 Molecular Formula: C8H11N5O3 Molecular Weight: 225.20 Standard : USP27 Appearance: White crystalline powder Assay (on dry basis) 98.0-102.0% (HPLC)