Using NO, Cc1ccc(NC(=O)[C@H](CC2CCC(=O)CC2)c2ccc(S(C)(=O)=O)c(Cl)c2)nc1 to produce Cc1ccc(NC(=O)[C@H](CC2CCC(=NO)CC2)c2ccc(S(C)(=O)=O)c(Cl)c2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.