Using O=C1c2ccccc2C(=O)N1c1csc(Br)n1, C[Sn](C)(C)c1ccc(CO)nc1 to produce O=C1c2ccccc2C(=O)N1c1csc(-c2ccc(CO)nc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.