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 alkanes [CnH2n+2] - saturated acyclic hydrocarbons
                   branched alkanes
                     1.1 isobutane - C₄H₁₀
                     1.2 neopentane - C₅H₁₂
                     2 isopentane - C₅H₁₂
                     3.1 isohexane - C₆H₁₄
                     3.2 3-methylpentane - C₆H₁₄
                     3.3 2,2,4-trimethylpentane - C₈H₁₈