Using CC(=Cc1cnc2nc(N)nc(N)c2c1)c1ccc(C(=O)OC(C)(C)C)cc1 to produce CC(=Cc1cnc2nc(N)nc(N)c2c1)c1ccc(C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.