3,5-Dihydroxy-4-isobutyryl-2-methyl-4-(3-methyl-2-butenyl)-6-(2,4,6-trihydroxy-3-isobutyryl-5-(3-methyl-2-butenyl)benzyl)-2,5-cyclohexadien-1-one AIDS-150916 AIDS150916 NSC689443