Using COCC1CO1, O=C(O)CN1CCNCCN(CC(=O)O)CCN(CC(=O)O)CC1 to produce COCC(O)CN1CCN(CC(=O)O)CCN(CC(=O)O)CCN(CC(=O)O)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.