Using CN(CC(=O)N[C@@H](CO)C(=O)OC(C)(C)C)NC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21, O=C1CCC(=O)O1 to produce COC(=O)CN(C)NC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.