Synonyms: Pennigritrem;AC1L43H2;139682-30-7;6,7-(Epoxymethano)-5H-cyclobuta(5,6)benz(1,2- e)oxeto(3'',2'':2',3')oxireno(4',4'a)(1)benzopyrano(5',6':6,7)indeno(1,2-b)indole-3b,6d(4H,5aH)-diol, 11-chloro- 1,2a,2b,6,7,8,8a,9,10,13,13b,13c,14,15,15a,16a-hexadecahydro-1,1,13b,13c,17,17-hexamethyl-9-methylene-, (2aS-(2aalpha,2bbeta,3aR*,3balpha,5abeta,6beta,6dalpha,7alpha,8aalpha,13balpha,13cbeta,15aalpha,16aalpha))-