def METHOD_NAME(file_name):
  strudat_entries = strudat.read_all_entries(open(file_name))
  if (len(strudat_entries.entries) > 1):
    raise MultipleEntriesError(
      "strudat file %s may contain only one structure." % file_name)
  assert len(strudat_entries.entries) == 1
  return strudat_entries.entries[0].as_xray_structure().as_emma_model()