Coriamyrtin

(7S,8R)-1aβ,1b,5,6,6a,7aβ-Hexahydro-1bα-hydroxy-6aα-methyl-8-(1-methylethenyl)spiro[2α,5α-methano-7H-oxireno[3,4]cyclopent[1,2-d]oxepine-7,2'-oxiran]-3(2H)-one