Using O=C1CCOCC1, CSc1ccc2c(ccn2S(=O)(=O)c2ccccc2)c1 to produce CSc1ccc2c(c1)cc(C1(O)CCOCC1)n2S(=O)(=O)c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.