(1S,4aS)-1,4a-dimethyl-1,2,3,4,4a,5,6,8a-octahydronaphthalene + acetone => (1E,4S,5E,7R)-germacra-1(10),5-dien-11-ol
(1s,4as)-1,4a-dimethyl-1,2,3,4,4a,5,6,8a-octahydronaphthalene + acetone => (1e,4s,5e,7r)-germacra-1(10),5-dien-11-ol