Using COC(=O)Cn1cc(C[C@H]2NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](C(C)C)NC(=O)[C@@H]3CCCN3C(=O)[C@@H](CC(=O)OCc3ccccc3)NC2=O)c2ccccc21 to produce CC(C)C[C@@H]1NC(=O)[C@@H](C(C)C)NC(=O)[C@@H]2CCCN2C(=O)[C@@H](CC(=O)O)NC(=O)[C@@H](Cc2cn(CC(=O)O)c3ccccc23)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.