Using O=C(O)c1n[nH]c2c1nc(-c1ccccc1)c1ccccc12, O=C([O-])O to produce COC(=O)c1n[nH]c2c1nc(-c1ccccc1)c1ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.