momilactone A

8α-Vinyl-2,3a,8,9,10,10aα,10b,10cβ-octahydro-3aβ,8,10bα-trimethyl-1H-phenanthro[10,1-bc]furan-3,4(5aβH,7H)-dione

(3aR)-8α-Vinyl-2,3a,8,9,10,10aα,10b,10cβ-octahydro-3aβ,8,10bα-trimethyl-1H-phenanthro[10,1-bc]furan-3,4(5aβH,7H)-dione