1H-Phenanthro(10,11-bc)furan-3,4-(2H,3aH)-dione, 8-ethenyl-5a,7,8,9,10,10a,10b,10c-octahydro-3a,8,10b-trimethyl-, (3aR-(3aalpha,5aalpha,8beta,10abeta,10bbeta,10calpha))- 51415-07-7 Momilacton A Momilactone A