#alkyl_radical__alkylradical__alkyl__alkyl_group__alkylgroup  any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
  supertype:  #chemical_group__group__radical  (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
  subtype:  #ethyl_radical__ethylradical__ethyl__ethyl_group__ethylgroup  the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom
  subtype:  #methyl_radical__methyl__methyl_group  the univalent radical CH3- derived from methane
     subtype:  #aminomethane  a methyl with the hydrogen atom replaced by an amino radical
     subtype:  #hydroxymethyl  a methyl with hydroxide replacing the hydrogen atoms

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