Using CC(C)(C)OC(=O)c1c(N)sc2c1CC(C(=O)O)OC2, Nc1ccccc1 to produce CC(C)(C)OC(=O)c1c(N)sc2c1CC(C(=O)Nc1ccccc1)OC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.