1,3-dimethyl-5,10-dioxo-5,10-dihydro-benzo[g]isoquinoline-4-carboxylic acid methyl ester

methyl 6,7-dibromo-5,8-dihydro-1,3-dimethyl-5,8-dioxoisoquinoline-4-carboxylate

methyl 6,7-dichloro-5,8-dihydro-1,3-dimethyl-5,8-dioxoisoquinoline-4-carboxylate

methyl 6-chloro-1,3-dimethyl-5,8-dioxo-7-(p-tolylamino)-5,8-dihydroisoquinoline-4-carboxylate

methyl 6-bromo-7-(4-methoxyphenyl)amino-1,3-dimethyl-5,8-dioxo-5,8-dihydroisoquinoline-4-carboxylate