CH4\mathrm{CH}_{4}CH4
CH3OH\mathrm{CH}_{3} \mathrm{OH}CH3OH
CH2H5OH\mathrm{CH}_{2} \mathrm{H}_{5} \mathrm{OH}CH2H5OH
H2O\mathrm{H}_{2} \mathrm{O}H2O
C2H4\mathrm{C}_{2} \mathrm{H}_{4}C2H4