Synonyms: Penitrem A,6-dechloro-15-deoxy-2,3,11,33-tetrahydro-10-oxo-;7,8-(Epoxymethano)-2H,6H-cyclobuta[5,6]benz[1,2-e]oxireno[4',4'a]-1-benzopyrano[5',6':6,7]indeno[1,2-b]indol-10(7H)-one,3,3a,4b,5,6a,7a,7d,8,9,9a,10,14,14a,14b,14c,15,16,16a-octadecahydro-3,4b-dihydroxy-10,14b,14c,17,17-pentamethyl-2-(1-methylethenyl)-,(2R,3S,3aR,4aS,4bS,6aR,7S,7dS,8S,9aS,14bS,14cR,16aS)-[partial]-; Penitremone A