Synonyms: Penitrem A,6-dechloro-15-deoxy-;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]indole-3,4b(5H)-diol,3,3a,6a,7,7d,8,9,9a,10,11,14,14b,14c,15,16,16a-hexadecahydro-14b,14c,17,17-tetramethyl-10-methylene-2-(1-methylethenyl)-,[2R-(2a,3a,3aa,4aS*,4bb,6aa,7a,7db,8b,9ab,14bb,14ca,16ab)]-; Penitrem B; Tremortin B