Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class imidic acids [RkE(=O)l(OH)m (l≠0; ≥1 (=O):=(=NR))]
                 1 Class carboximidic acids [RC(=NR)OH]
                 2 Class sulfonodiimidic acids [RS(=NR)2OH]