Using O=C1NCCC1Br, C[C@]1(N2CCc3c(-c4cnc(N)nc4)nc(N4CCOCC4)nc32)CCNC1 to produce C[C@]1(N2CCc3c(-c4cnc(N)nc4)nc(N4CCOCC4)nc32)CCN(C2CCNC2=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.