Using COC(=O)c1cc(Br)cc2cc[nH]c12, CC1(C)CC(=O)CCS1 to produce COC(=O)c1cc(Br)cc2c(C3CCSC(C)(C)C3)c[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.