−NO2−CHO-\mathrm{NO}_{2}-\mathrm{CHO}−NO2−CHO
−NH2,−COOH-\mathrm{NH}_{2},-\mathrm{COOH}−NH2,−COOH
−Cl,−CHO-\mathrm{Cl},-\mathrm{CHO}−Cl,−CHO
−OH,−CH3-\mathrm{OH},-\mathrm{CH}_{3}−OH,−CH3
