Using BrCc1ccccc1, CCOC(=O)c1cnc2c(S)cccn2c1=O to produce CCOC(=O)c1cnc2c(SCc3ccccc3)cccn2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.