对二甲苯

5-溴甲基-3-甲基-1H-吡咯-2,4-二羧酸二乙酯

2,4-二甲基吡咯-3,5-二羧酸二乙酯

diethyl 5-(hydroxymethyl)-3-methyl-1H-pyrrole-2,4-dicarboxylate

diethyl 5-(chloromethyl)-3-methyl-1H-pyrrole-2,4-dicarboxylate