D-Gulonic acid β-lactoneD-(-)-GULONO-γ-LACTONED-Gulonic acid-1,4-lactoneD-Gulonic acid γ-lactoneD-古洛糖酸-1,4-内酯D-Gulono γ-lactoneD-(-)-古洛糖酸 γ-内酯D-(-)-Gulono-1,4-lactoneD-Gulono-1,4-lactoneD-(-)-古洛糖酸-1,4-内酯D-古洛糖酸 γ-内酯NSC 34392D-GulonolactoneD-Gulono-1,4-lactone1,4-D-Gulonolactone