Using O=C1CCCCC1, COC(=O)c1ccc(C(=O)c2ccc(O)cc2)cc1 to produce COC(=O)c1ccc(C(=C2CCCCC2)c2ccc(O)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.