Synonyms: MarcfortineA; (-)-Marcfortine A; NSC 324645; Nb-Methylmarcfortine B; PNU 94119;Spiro[4H,8H-[1,4]dioxepino[2,3-g]indole-8,2'(3'H)-[1H,4H-3a,9a](iminomethano)cyclopenta[b]quinolizine]-9,11'(10H)-dione,6',7',8',9',10',10'a-hexahydro-1',1',4,4,12'-pentamethyl-, [2'R-(2'a,3'aa,9'aa,10'aa)]-; [2'R-(2'a,3'aa,9'aa,10'aa)]-6',7',8',9',10',10'a-Hexahydro-1',1',4,4,12'-pentamethylspiro[4H,8H-[1,4]dioxepino[2,3-g]indole-8,2'(3'H)-[1H,4H-3a,9a](iminomethano)cyclopenta[b]quinolizine]-9,11'(10H)-dione