Using COC(=O)c1cnc(C2=CCN(C(=O)OC(C)(C)C)CC2)nc1 to produce COC(=O)c1cnc(C2CCN(C(=O)OC(C)(C)C)CC2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.