Using COc1cc2nc(N3CCN(C(=O)OCc4ccccc4)[C@H](C(=O)NC(C)(C)C)C3)nc(N)c2cc1OC to produce COc1cc2nc(N3CCN[C@H](C(=O)NC(C)(C)C)C3)nc(N)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.