Using COc1nc(OC(C(=O)OCc2ccccc2)C(OC)(c2ccccc2)c2ccccc2)nc2c1CCC2 to produce COc1nc(OC(C(=O)O)C(OC)(c2ccccc2)c2ccccc2)nc2c1CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.