Using O=C(CC1CN(C(=O)C2CC2)C1)NNC(=O)Nc1ccc(Br)cc1 to produce O=C(C1CC1)N1CC(Cc2n[nH]c(=O)n2-c2ccc(Br)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.