Using COC(=O)C1NC(=O)C(C(=O)OC)C1c1c(OC)cc(OC)cc1OC to produce COC(=O)C1NC(=O)CC1c1c(OC)cc(OC)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.