Using CCOP(=O)(Cc1ccc(C(=O)Nc2ccccc2C(=O)OC)cc1)OCC to produce CCOP(=O)(Cc1ccc(C(=O)Nc2ccccc2C(=O)O)cc1)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.