Using O=S(=O)(O)O, CC(C)(C)OC(=O)N1CCC(C)(O)c2ccccc21 to produce CC1CC(=O)N(C(=O)OC(C)(C)C)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.