Identity of eleutheroside E with acanthoside D. Yu. S. Ovodov, G. M. Frolova, L. A. Elyakova and G. B. Elyakov, Bulletin of the Academy of Sciences of the USSR, Division of chemical science, November 1965, Volume 14, Issue 11, pages 2035-2036, doi:10.1007/BF00845912 /wiki/Doi_(identifier)