Using CCCCOc1ccc(C=O)cc1O, COc1cc(OC)cc(C(C)=O)c1 to produce CCCCOc1ccc(/C=C/C(=O)c2cc(OC)cc(OC)c2)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.