Two undescribed constituents from <i>Schisandra chinensis</i> (Turcz.) Baill. and evaluation of their anti-oxidant activity

Phytochemical investigation of <i>Schisandra chinensis</i> (Turcz.) Baill. stems and leaves yielded two new descending triterpenes, pre-schisanyyqxin A (<b>1</b>) and pre-schisanyyqxin B (<b>2</b>), along with six known congeners (<b>3</b>-<b>8</b>). Structural characterisation was accomplished through integrated spectroscopic analysis (1D/2D NMR, HRESIMS, UV-Vis) complemented by ECD calculations and literature comparison. Additionally, the compounds were tested for their anti-oxidant capacity, with compounds <b>3</b>-<b>8</b> exhibiting varying degrees of anti-oxidant activity.