HCOOH \mathrm {HCOOH}HCOOH
CH3COOH \mathrm {CH_3COOH}CH3COOH
CH3CH(OH)CH3 \mathrm {CH_3CH(OH)CH_3}CH3CH(OH)CH3
CH3COCH3 \mathrm {CH_3COCH_3}CH3COCH3