Using C[C@@H]1[C@H]2C[C@@H](C[C@H]1Nc1cnn(CC(=O)NCC3CCN(C(=O)OC(C)(C)C)CC3)c(=O)c1Br)C2(C)C to produce C[C@@H]1[C@H]2C[C@@H](C[C@H]1Nc1cnn(CC(=O)NCC3CCNCC3)c(=O)c1Br)C2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.