Using O=C1CC[C@@H](C(=O)O)N1, CC(C)C[C@H](N)CNCC(=O)OC(C)(C)C to produce CC(C)CC(CNCC(=O)OC(C)(C)C)NC(=O)C1CCC(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.