loop_
    _chem_comp_chir_atom.comp_id
    _chem_comp_chir_atom.chir_id
    _chem_comp_chir_atom.atom_id
      phe  1  N
      phe  1  C
      phe  1  CB
      val  1  N
      val  1  C
      val  1  CB
   # - - - - data truncated for brevity - - - -