4H-3,10b-Ethano-1H,3H-benzo(f)furo(4,3,2-de)-2-benzopyran-4-one, 8-ethenyl-3a,5a,7,8,9,10,10a,10c-octahydro-3a,8-dimethyl-, (3S-(3alpha,3abeta,5abeta,8alpha,10aalpha,10bbeta,10cbeta))- 51415-08-8 Momilacton B Momilactone B