Retraction Note to: Chemistry of Natural Compounds 2013, 48(6):1013–1016
This article has been retracted by the author Lihui Jiang because the copyright owner of the article is the Shanghai Institute of Materia Medica where the research was conducted; the author and Central South University did not contribute to the research; and no permission was obtained from the Shanghai Institute of Material Medica for the publication of the article.
The online version of the original article can be found under doi:10.1007/s10600-013-0452-0.
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Jiang, L. Retraction Note to: Three tetranortriterpenoids from Walsura yunnanensis . Chem Nat Compd (2015). https://doi.org/10.1007/s10600-015-1366-9