Using CCOC(=O)/C=C/c1ccc(OCc2ccc(OCC(=O)c3ccccc3)cc2)nc1 to produce CCOC(=O)CCc1ccc(OCc2ccc(OCC(=O)c3ccccc3)cc2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.