7,11,12-Tris(acetyloxy)-3-chloro-6a,8-dihydroxy-6,8,11a-trimethyl-2-methylene-5-oxohexadecahydrobenzo[4,5]oxireno[2',3':7,8]cyclodeca[1,2-b]furan-9-yl butyrate AIDS-148196 AIDS148196 NSC679588