Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class nucleosides
                 Class deoxyribonucleosides
                   deoxyadenosine
                   deoxycytidine
                   deoxyguanosine
                   deoxythymidine