Using COc1cc2nccc(Oc3ccc(NC(=O)CCOc4ccccc4)cc3)c2cc1OC to produce COc1cc2nccc(Oc3ccc(NCCCOc4ccccc4)cc3)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.