Using O=C([O-])[O-], Brc1ccc(-c2n[nH]c3c2Cc2sccc2-3)cn1 to produce O=C1c2sccc2-c2[nH]nc(-c3ccc(Br)nc3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.