Using OB(O)c1cccs1, CCOC(=O)c1cc2sc(Br)cc2n1Cc1ccc(Cl)c(Cl)c1 to produce CCOC(=O)c1cc2sc(-c3cccs3)cc2n1Cc1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.