The chemical Entecavir has a designated molecular formula of C12H15N5O3 and a molecular weight of 277.284 g/mol. Synonyms may include: BMS 200475, SQ 34676, Baraclude, HSDB 7334, UNII-NNU2O4609D (ChemID). Entecavir has been assigned a MeSH pharmacological action of: Antivirals.