Using O=C1Cc2cc(Br)ccc2N1, OB(O)c1ccc(-c2ccccc2)s1 to produce O=C1Cc2cc(-c3ccc(-c4ccccc4)s3)ccc2N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.