Using O=C([O-])CN(CCN(CC(=O)O)CC(=O)O)CC(=O)[O-] to produce O=C(O)CN(CCN(CC(=O)O)CC(=O)O)CC(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.