31105-79-0 Cyclodeca(b)furan-2(3H)-one, 3a,4,5,6,7,8,9,11-octahydro-7-hydroperoxy-10-methyl-3,6-bis(methytlene)-, (3aS-(3aR*,7S*,10E,11aS*))- NSC 293103 PEROXYCOSTUNOLIDE