Using O=C(O)c1cccnc1S, CC1(C)CC1C(=O)N/C(=C\CCCCBr)C(=O)O to produce CC1(C)CC1C(=O)N/C(=C\CCCCSc1ncccc1C(=O)O)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.