Using CN(C(=O)OC(C)(C)C)c1cncc(C(=O)c2cn(C(C)(C)C)c3ncncc23)c1 to produce CNc1cncc(C(=O)c2cn(C(C)(C)C)c3ncncc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.