Using COc1cccc(C23CCN(C)C(C)C2(C)CCC(O)C3)c1, NO to produce COc1cccc(C23CCN(C)CC2(C)CCC(=NO)C3)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.