Using O=C1CCC(=O)N1Br, CCCC=C1SC(=O)N(CCCCSc2cccc3nccn23)C1=O to produce CCCC=C1SC(=O)N(CCCCSc2cccc3ncc(Br)n23)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.