Using O=C1Nc2nc(C3CCCC3)n(Cc3ccccc3)c2C2=N[C@H](Cc3ccccc3)CN12, COC(=O)CBr to produce COC(=O)CN1C(=O)N2C[C@@H](Cc3ccccc3)N=C2c2c1nc(C1CCCC1)n2Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.