Using C[C@@H]1C(=O)NN=C2COc3ccc(C4=CCN(C(=O)OC(C)(C)C)[C@H](Cc5ccccc5)C4)cc3N21 to produce C[C@@H]1C(=O)NN=C2COc3ccc(C4CCN(C(=O)OC(C)(C)C)[C@H](Cc5ccccc5)C4)cc3N21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.