dimethyl 3-phenyl-1,2-oxazole-4,5-dicarboxylate

6-chloro-1-methylquinoxalin-2-one

ethyl 6-methoxy-4-oxo-1H-quinoline-2-carboxylate

tetraethyl benzene-1,2,4,5-tetracarboxylate

5-氧代-2,5-二氢-1H-吡唑-3-甲酰肼