Using CC(C)(C)OC(=O)CC1(CC(=O)OC(C)(C)C)C(=O)OC(C)(C)OC1=O to produce CC(C)(C)OC(=O)CC(CC(=O)OC(C)(C)C)(C(=O)O)C(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.