CH3COOH\mathrm{CH}_{3} \mathrm{COOH}CH3COOH
HCOOH\mathrm{HCOOH}HCOOH
ClCH2CHO\mathrm{ClCH}_{2} \mathrm{CHO}ClCH2CHO
C6H5NH2\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}C6H5NH2