Using CCOC(=O)[C@H]1O[C@H]1C(=O)N[C@@H](CC(C)C)C(=O)NCCCCNC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21 to produce CC(C)C[C@H](NC(=O)[C@H]1O[C@@H]1C(=O)O)C(=O)NCCCCNC(=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.