1856-58-2 Decahydro-3,8a-dimethyl-5-methylenenaphtho(2,3-b)furan-2(3H)-one (3S-(3alpha,3abeta,4abeta,8aalpha,9abeta))- Naphtho(2,3-b)furan-2(3H)-one, decahydro-3,8a-dimethyl-5-methylene-, (3S-(3alpha,3abeta,4abeta,8aalpha,9abeta))-