#chemical_chain__chain  a series of linked atoms (generally in an organic molecule)
  supertype:  building_block__unit  a single undivided natural entity occurring in the composition of something else; "units of nucleic acids"
  part of:  molecule
  subtype:  closed_chain__ring  (chemistry) a chain of atoms in a molecule that forms a closed loop
  subtype:  open_chain  a chain of atoms in a molecule whose ends are not joined to form a ring
     subtype:  branched_chain  an open chain of atoms with one or more side chains attached to it
     subtype:  straight_chain  an open chain of atoms with no side chains

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