Using CCOC(=O)c1cc(Br)cc2c(CC3CCSC3)c[nH]c12, O=S([O-])[O-] to produce CCOC(=O)c1cc(Br)cc2c(CC3CCS(=O)(=O)C3)c[nH]c12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.