Using O=C1CCCc2cc(O)ccc21, COc1cc(C=O)cc(OC)c1 to produce COc1cc(C=C2CCc3cc(O)ccc3C2=O)cc(OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.