6'-(2,8-Dihydroxy-1,5,7,9,13,15,17-heptamethyl-nonadeca-3,5,11,13-tetraenyl)-3,4,4'-trihydroxy-6-hydroxymethyl-3,4,5,6-tetrahydro-2H-[2,3']bipyranyl-2'-one AIDS-163372 AIDS163372 YM-202204