Using CCOC(=O)c1cc(Cl)cnc1[C@@H](NC(=O)OC(C)(C)C)C(C)C, CNOC to produce CC(=O)c1cc(Cl)cnc1[C@@H](NC(=O)OC(C)(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.