Using Cc1nc(CN2C[C@@H]3C[C@H]2CN3C(=O)OC(C)(C)C)c2nc(C3CCC(C)(C)CC3)sc2n1 to produce Cc1nc(CN2C[C@@H]3C[C@H]2CN3)c2nc(C3CCC(C)(C)CC3)sc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.