6-chloro-1'-ethyl-2-methylspiro[isoquinoline-4,3'-pyrrolidine]-1,2',3,5'-tetrone
6-chloro-1'-ethyl-2-methyl-spiro[isoquinoline-4,3'-pyrrolidine]-1,2',3,5'-tetrone
6-chloro-1'-ethyl-2-methyl-spiro[isoquinoline-4,3'-pyrrolidine]-1,2',3,5'-diquinone