Using CC(=O)OC(C(=O)NC1CC1)[C@H](CC1CCC1)NC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N[C@@H](CC1CCC1)C(O)C(=O)NC1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.