Using C[C@@H](CO)NC(=S)[C@@H](CC(=O)OC(C)(C)C)NC(=O)OC(C)(C)C, O=[N+]=O to produce C[C@@H](CO[N+](=O)[O-])NC(=S)[C@@H](CC(=O)OC(C)(C)C)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.