1-Oxoeudesm-7(11)-en-8,12-olide 108044-20-8 Naphtho(2,3-b)furan-2,8(4H,5H)-dione, 4a,6,7,8a,9,9a-hexahydro-3,5,8a-trimethyl-, (4aS-(4aalpha,5alpha,8abeta,9abeta))-