Using COc1ccc(C(=O)/C=C/c2cc(Cl)cc(Cl)c2)cn1 to produce O=C(/C=C/c1cc(Cl)cc(Cl)c1)c1ccc(=O)[nH]c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.