1684-54-4 4,5,5a,6,7,8,9,9a-Octahydro-6,6,9a-trimethylnaphtho(1,2-c)furan-1(3H)-one trans- Naphtho(1,2-c)furan-1(3H)-one, 4,5,5a,6,7,8,9,9a-octahydro-6,6,9a-trimethyl-, trans-