| 9-(4-bromophenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydro-(2H,5H)-acridine-1,8-dione | 
                            
                            
                                | 3,3,6,6-tetramethyl-9-(4-bromophenyl)-3,4,5,6,9,10-hexahydroacridine-1,8(2H,7H)-dione | 
                            
                            
                                | 9-(4-bromophenyl)-3,4,5,6,9,10-hexahydro-3,3,6,6-tetramethylacridine-1,8(2H,7H)-dione | 
                            
                            
                                | 9-(4-Bromo-phenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione | 
                            
                            
                                | 3,3,6,6-tetramethyl-9-(4-bromophenyl)-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione | 
                            
                            
                                | 9-(4-bromophenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione | 
                            
                            
                                | 3,3,6,6-tetramethyl-9-(4-bromophenyl)-1,2,3,4,5,6,7,8,9,10-decahydroacridin-1,8-dione |