Using [NH4+], CC(=O)OC(C(=O)C(C)(C)C)C(=O)C(C)(C)C to produce Cc1nc(C(C)(C)C)c(C(=O)C(C)(C)C)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.