Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class amidines [RnE(=NR)NR2]
                 1 Class carboxamidines [RC(=NR)NR2]
                 2 Class phosphinamidines [R2P(=NR)NR2]
                 3 Class sulfinamidines [RS(=NR)NR2] - amidines of sulfinic acids