Using CN1C(=O)CCc2cc(-c3cncc(OCCNC(=O)OC(C)(C)C)c3)ccc21 to produce CN1C(=O)CCc2cc(-c3cncc(OCCN)c3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.