HCOOH\mathrm {HCOOH}HCOOH
CH3COOH\mathrm {CH_3COOH}CH3COOH
CH3CH2COOH\mathrm {CH_3CH_2COOH}CH3CH2COOH
CH3COOC2H5\mathrm {CH_3COOC_2H_5}CH3COOC2H5