6-(4-Bromo-phenyl)-11-phenyl-8,9-dihydro-azepino[1,2-a]quinoxaline-7,10-dicarboxylic acid dimethyl ester

2-(4-bromophenyl)quinoxaline

dimethyl 2,5-dimethylidenehexanedioate

dimethyl 2,5-dioxohexanedioate