4,5-二氧代-4,5-二氢-1H-吡咯[2,3-f]喹啉-2,7,9-三羧酸三甲酯

4-amino-5-bromo-2-ethoxybenzoic acid

methyl 4-acetamido-5-bromo-2-hydroxybenzoate

methyl 4-acetamido-5-chloro-2-prop-2-ynoxybenzoate

methyl 6-acetamido-4-methoxy-1H-indole-2-carboxylate