1,3-dihydro-3-oxo-1-isobenzofuranol

1-methyl-3,4-dimethoxycarbonyl-2-pyrazoline

1-methyl-3,4-dimethoxycarbonylpyrazole

1-甲基-1H -吡唑- 4 -羧酸甲酯

dimethyl 4-bromo-5-oxocyclohexane-1,2-dicarboxylate