Using CC1(C)[C@H](C(=O)O)CC[C@]1(C)C(=O)O, CO to produce COC(=O)[C@@H]1CC[C@](C)(C(=O)O)C1(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.