4-溴-3-氧代-丁酸甲酯

methyl (3-hydroxy-2-methoxycarbonyl-5-methylphenyl)acetate

methyl 5-methoxy-3-oxohex-4-enoate

甲基5-(4-甲氧基苯基)-3,5-二氧代戊酸酯

3,5-二羰基-辛酸甲酯