.delta.4(8)-Desbenzylidenerubabine 1-[7,9-Dihydroxy-2-methyl-5-(1-methylethylidene)-3,4,5,6-tetrahydro-2H-2,6-methano-1-benzoxocin-8-yl]ethanone 43230-46-2 AIDS-015727 AIDS015727 NSC270332