Using CCOC(C)=O, O=C(O)CC(=Cc1ccco1)C(=O)C=Cc1ccco1 to produce CCOC(=O)CC(=Cc1ccco1)C(=O)C=Cc1ccco1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.