Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class alkaloids
                 aconitine [C34H47NO11]
                 anabasine
                 arecoline
                 berberine
                 brucine
                 cinchonine
                 codeine
                 colchicine
                 coniine
                 curarine
                 emetine
                 ephedrine
                 hygrine
                 hyoscine
                 kinine
                 lupinine
                 morphine [C17H19NO3]
                 muscimol
                 nicotine
                 noscapine
                 papaverine
                 pilocarpine
                 piperidine
                 piperine
                 Class pyrrolizidine alkaloids
                 reticuline
                 ricinine
                 strychnine
                 thebaine
                 trigonelline
                 Class tropane alkaloids
                 Class xanthines
                 yohimbine