Composition #2: Desbene, S., Hanquet, B., Shoyama, Y., Wagner, H., Lacaille-Dubois, MA. Biologically active triterpene saponins from callus tissue of Polygala amarella. JOURNAL OF NATURAL PRODUCTS, 1999, vol. 62, no. 6, p. 923-926. DOI: 10.1021/np980577i.
[
DOI link]