My apologies - there was an error in that script, I forgot to delete prodrg 
droppings - this one is better:

menu=coot_menubar_menu("Custom")
def make_alkyl_chain():
  def make_alkyl_chain_length_n(n):
    smiles_string=int(n)*"c"
    new_molecule_by_smiles_string(smiles_string,smiles_string)
    delete_hydrogens(molecule_number_list()[-1])
    mol_id=molecule_number_list()[-1]
    ch_id="A"
    res_no=1
    ins_code=""
    new_residue_name="UNL"
    set_residue_name(mol_id,ch_id,res_no,ins_code,new_residue_name)
    prodrg_ify(mol_id,ch_id,res_no,ins_code)
    close_molecule(molecule_number_list()[-1])
    close_molecule(molecule_number_list()[-1])
    if imol_refinement_map()!=-1:
      fit_chain_to_map_by_random_jiggle(mol_id,ch_id,1000,0.1)
  generic_single_entry("How many carbons do you want in the chain?",
    "10","Make alkyl chain",make_alkyl_chain_length_n)
add_simple_coot_menu_menuitem(menu, "Make alkyl chain of length n", lambda 
func: make_alkyl_chain())

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