HCHO\mathrm{HCHO}HCHO
CH3COOH\mathrm{CH}_{3} \mathrm{COOH}CH3COOH
C2H5OH\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}C2H5OH
CH3OH\mathrm{CH}_{3} \mathrm{OH}CH3OH