Using O=C1CCSCC1, CCOC(=O)c1cc(Br)cc2cc[nH]c12 to produce CCOC(=O)c1cc(Br)cc2c(C3CCSCC3)c[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.