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