MONO-DESACETYL FAMCICLOVIR;Famciclovir Related Compound B (20 mg) [4-(2-Amino-9H-purin-9-yl)-2-(hydroxymethyl)butyl acetate];2-[2-(2-AMino-9H-purin-9-yl)ethyl]-1,3-propanediol 1-Acetate;BRL 43594;FaMciclovir Related CoMpound B;2-[2-(2-Amino-9H-purin-9-yl)ethyl]-1,3-propanediol monoacetate (ester);4-(2-Amino-9H-purin-9-yl)-2-(hydroxymethyl)butyl acetate;Famciclovir USP RC B