Using COC(=O)C1CCC(C(=O)OC(C)(C)C)N(C(=O)OC(C)(C)C)C1 to produce CC(C)(C)OC(=O)C1CCC(C(=O)O)CN1C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.