Using O=Cc1cccc(C(=O)O)c1, COc1ccc(OC)c(C(C)=O)c1 to produce COc1ccc(OC)c(C(=O)C=Cc2cccc(C(=O)O)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.