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