text: def to_openmm_Modeller(item, selection='all', model_indices='all', syntaxis='MolSysMT'):
  
      from molsysmt.tools.string_pdb_text import is_string_pdb_text
      from molsysmt.basic import convert
  
      if not is_string_pdb_text(item):
          raise ValueError
  
      tmp_item = convert(item, to_form='openmm.Modeller', selection=selection, frame_indices=model_indices, syntaxis=syntaxis)
  
      return tmp_item
  
  