- CH3−COOC6H5C H_{3}-C O O C_{6} H_{5}
- CH2=CH−COOCH3C H_{2}=C H-C O O C H_{3}.
- CH3−COOCH=CH2C H_{3}-C O O C H=C H_{2}.
- CH3−COOC2H5C H_{3}-C O O C_{2} H_{5}.