Using CCOC(=O)c1cc(OCC(=O)OCc2ccccc2)n(-c2ccccc2)n1 to produce CCOC(=O)c1cc(OCC(=O)O)n(-c2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.