[chemical substances]
   compounds
     Class amides [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(NR2))]
       Class anilides [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(NHPh))]
         acetanilide [CH3C(=O)NHPh]