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 hep·tane /ˈhɛpˌten/
 庚烷

 Hep·tane n.  Chem. Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); -- so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.
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 heptane
      n : a colorless volatile highly flammable liquid obtained from
          petroleum and used as an anesthetic or a solvent or in
          determining octane ratings