Using OB(O)c1ccc(-c2ccccc2)s1, NC(Cc1c[nH]c2ccc(Br)cc12)C(=O)O to produce NC(Cc1c[nH]c2ccc(-c3ccc(-c4ccccc4)s3)cc12)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.