Using O=C([O-])[O-], CC(C)(C)OC(=O)NC1(C(=O)O)CCC(=O)CC1 to produce COC(=O)C1(NC(=O)OC(C)(C)C)CCC(=O)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.