Using COC(CO)c1cc(C(O)CN(Cc2ccccc2)C(C)(C)C)ccc1OCc1ccccc1 to produce COC(CO)c1cc(C(O)CNC(C)(C)C)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.