162558-88-5

2-Butenoicacid, 2-methyl-,7-(acetyloxy)-3',4,4',5',6,6',7,8-octahydro-3'-hydroxy-6',7-dimethyl-6,8-dioxospiro[3H-2-benzopyran-3,2'-[2H]pyran]-4-ylester, [3R-[3a(3'R*,6'S*),4b(E),7b]]-