ethyl 2-hydroxy-4-oxo-4-(4-methylphenyl)-2-butenoate

硝基乙酸乙酯

4-甲苯基乙炔

Cyclopropanecarboxylic acid, 2-(4-methylphenyl)-, ethyl ester

2,4-二氧代-4-(对甲苯)丁酸乙酯