Using CCOC(=O)[C@H](CS)NC(=O)OC(C)(C)C, BrCC1CC1 to produce CCOC(=O)C(CSCC1CC1)NC(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.