Using O=Cc1ccc(O)c(O)c1, O=C(O)CC(=O)Nc1ccccc1C(=O)O to produce O=C(/C=C/c1ccc(O)c(O)c1)Nc1ccccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.