124265-89-0 2-HMHBG 6H-Purin-6-one, 2-amino-1,9-dihydro-9-(4-hydroxy-2-(hydroxymethyl)butyl)- (R)-; 9-((R)-4-Hydroxy-2-(hydroxymethyl)butyl)guanine A-182091 ABT-O91 H2G Omaciclovir Omaciclovir [USAN:INN]