Using NO, COC(=O)CC=C(C(=O)c1ccc(OC)cc1)c1ccc(OC)cc1 to produce COC(=O)CC=C(C(=NO)c1ccc(OC)cc1)c1ccc(OC)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.