Using COC(=O)C(CC1CCCC1)c1ccc2c(c1)CCS2(=O)=O to produce O=C(O)C(CC1CCCC1)c1ccc2c(c1)CCS2(=O)=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.