Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class hydrocarbons [CxHy] - compounds consisting of carbon and hydrogen only
                 Class olefins
                   Class alkenes [CnH2n] - unsaturated acyclic hydrocarbons having one double bond
                     5,5-dimethyl-1-hexene [C8H16; CH2=CH[CH2]2C(CH3)2CH3]