2-Butenoic acid, 2-methyl-, [8-(acetyloxy)-5-[2-(2,5-dihydro-5-oxo-3-furanyl)ethyl]octahydro-5,6-dimethylspiro[naphthalene-1(8aH),2'-oxiran]-8a-yl]methyl ester, (2E)- AIDS-135618 AIDS135618 Ajugacumbin A NSC635594