Using Cc1n[nH]c2ncccc12, CC(C)(C)OC(=O)OC(=O)OC(C)(C)C to produce Cc1nn(C(=O)OC(C)(C)C)c2ncccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.