Alchornealaxine, an Unusual Prenylguanidinyl-epicatechin Derivative from Alchornea laxiflora (Benth) Pax and Hoffman. - Tapondjou, Léon Azefack; Jenett-Siems, Kristina; Siems, Karsten; Melzig, Matthias F. (Records of Natural Products, 2016)