摘要：As part of the search for anticomplemertary active components from natural products, the anticomplementary properties of methanolic extracts from the flower buds of Magnolia fargesii have been investigated. Bioassayguided chromatographic separation of the active consituents led to the isolation of compound 1, whose structure was identified by spectroscopic methods to be kaempferol 3-O-β-D-(6"-O-coumaroyl)glucopyranoside (tiliroside). Tiliroside showed very potent anti-complement activity (IC50=5.4×10-5 M) on the classical pathway of the complement system, even higher than rosmarinic acid, which is a well-known inhibitor against the complement system. On the other hand, the hydrolysates of tiliroside, kaempferol, astragalin and p-coumaric acid showed very weak activity on this system.
