Using COc1cc(-c2cc(=O)c3ccc(O)cc3o2)cc(OC)c1OC, ClCC1CO1 to produce COc1cc(-c2cc(=O)c3ccc(OCC4CO4)cc3o2)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.