4-[(2,6-dichlorophenyl)amino]-1-(4-methoxybenzyl)pyridine-2,6-(1H,3H)-dione

1-(2,6-dichlorophenyl)-6-(4-methoxybenzyl)-1,6-naphthyridone-2,5,7-(1H,6H,8H)-trione

1,3-丙酮二羧酸二甲酯

4-溴-2-氯-3-碘吡啶