Using O=C1NC(=O)c2ccccc21, CC(C)(C)OC(=O)N[C@H]1CC[C@@H](CO)CC1 to produce CC(C)(C)OC(=O)N[C@H]1CC[C@@H](CN2C(=O)c3ccccc3C2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.