Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class alkaloids
                 Class tropane alkaloids
                   atropine
                   benzoylecgonine
                   cocaine [C17H21NO4]
                   ecgonine
                   hyoscyamine
                   scopolamine