Using O, CC(C)(C)OC(=O)N1CCc2nc3ccccc3c(C(N)=O)c2C1 to produce COC(=O)Nc1c2c(nc3ccccc13)CCN(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.