Spiro[furan-2(5H),7'-[2,5]methano[7H]oxireno[3,- 4]cyclopent[1,2-d]oxepin]-4-carboxaldehyde,1'a,1'b,2',3',5',6',6'a,7'a-octahydro-1'b,8'- dihydroxy-3,6'-dimethoxy-6'a-methyl-8'-(1- methylethyl)-3',5-dioxo-,(1'aS,1'bR,2S,2'S,- 5'R,6'S,6'aR,,7'aR,8'R)-