3-苯基异恶唑

dimethyl cyclopenta-2,5-diene-1,2-dicarboxylate

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

1-(4-nitrophenyl)triazole

1-(4-nitro-phenyl)-1H-[1,2,3]triazole-4,5-dicarboxylic acid dimethyl ester