Using Cc1ccccc1C=O, COC(=O)c1ccc2oc3c(c(=O)c2c1)CCC3 to produce COC(=O)c1ccc2oc3c(c(=O)c2c1)CCC3=Cc1ccccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.