Tetracyclic triterpenoid compound and its use in medicines

The inventor researches Panax pseudoginseng Wall. var. notoginseng (Burkill) Hoo et Tseng antitumor activity, separates a tetracyclic triterpenoid monomer compound (with a code name of Y1218) from an active part of saponin and identifies a molecular structure of the tetracyclic triterpenoid monomer compound through modern spectroscopy. The tetracyclic triterpenoid monomer compound has antitumor effects.