Using CCOC=O, COC(=O)N1c2cc(OC)c(OC)cc2C(=O)CC1C to produce COC(=O)N1c2cc(OC)c(OC)cc2C(=O)C(=CO)C1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.