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
                   unbranched alkanes
                     01 methane - CH₄
                     02 ethane - C₂H₆
                     03 propane - C₃H₈
                     04 butane - C₄H₁₀
                     05 pentane - C₅H₁₂
                     06 hexane - C₆H₁₄
                     07 heptane - C₇H₁₆
                     08 octane - C₈H₁₈
                     09 nonane - C₉H₂₀
                     10 decane - C₁₀H₂₂
                     11 undecane - C₁₁H₂₄
                     12 dodecane - C₁₂H₂₆
                     13 tridecane - C₁₃H₂₈
                     14 tetradecane - C₁₄H₃₀
                     15 pentadecane - C₁₅H₃₂
                     20 icosane - C₂₀H₄₂
                     30 triacontane - C₃₀H₆₂