docs: def match_RCSB_pdb_chains(pdb_id1, pdb_id2, cut_off = 60.0, allow_multiple_matches = False, multiple_match_error_margin = 3.0, use_seqres_sequences_if_possible = True, strict = True):
      '''A convenience function for match_pdb_chains. The required arguments are two PDB IDs from the RCSB.'''
      try:
          stage = pdb_id1
          pdb_1 = PDB(retrieve_pdb(pdb_id1), strict = strict)
          stage = pdb_id2
          pdb_2 = PDB(retrieve_pdb(pdb_id2), strict = strict)
      except (PDBParsingException, NonCanonicalResidueException, PDBValidationException), e:
          raise PDBParsingException("An error occurred while loading %s: '%s'" % (stage, str(e)))
  
      return match_pdb_chains(pdb_1, pdb_id1, pdb_2, pdb_id2, cut_off = cut_off, allow_multiple_matches = allow_multiple_matches, multiple_match_error_margin = multiple_match_error_margin, use_seqres_sequences_if_possible = use_seqres_sequences_if_possible)