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