Using COc1ccc(CCN(C)CCCN2CCc3cc(OC)c(OC)cc3C(=O)C2=O)cc1OC, NO to produce COc1ccc(CCN(C)CCCN2CCc3cc(OC)c(OC)cc3C(=NO)C2=O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.