Using CC(=O)OC(C)(C)C, CCOC(=O)C1(C(=O)OCC)CC1 to produce CCOC(=O)C1(C(=O)CC(=O)OC(C)(C)C)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.