TRANS-DEHYDROCROTONIN

(1R,5'R,4aα,8aβ)-2,3,4,4a,8,8a,4',5'-Octahydro-2α,5-dimethyl-5'α-(3-furanyl)spiro[naphthalene-1(7H),3'(2'H)-furan]-2',7-dione