#chemical_group__group__radical  (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
  supertype:  #building_block__unit  a single undivided natural entity occurring in the composition of something else; "units of nucleic acids"
  subtype:  #acyl_group  #alcohol_group  #aldehyde_group  #alkyl_radical  #allyl_radical  #azido_group  #azo_group  #benzyl_radical  #benzoyl_group  #cacodyl_radical  #carbonyl_group  #carboxyl_group  #chromophore  #cyano_group  #glyceryl  #hydrazo_group  #hydroxyl_radical  #ketone_group  #methylene_group  #propyl_radical  #nitrate  #nitrite  #uranyl_radical  #vinyl_radical
  part of:  #molecule  (physics and chemistry) the simplest structural unit of an element or compound

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