Bupleurum: A plant genus of the family APIACEAE that is the source of bupleurum root and of bupleurotoxin and is an ingredient of sho-saiko-to.Oleanolic Acid: A pentacyclic triterpene that occurs widely in many PLANTS as the free acid or the aglycone for many SAPONINS. It is biosynthesized from lupane. It can rearrange to the isomer, ursolic acid, or be oxidized to taraxasterol and amyrin.Sapogenins: The aglucon moiety of a saponin molecule. It may be triterpenoid or steroid, usually spirostan, in nature.Saponins: A type of glycoside widely distributed in plants. Each consists of a sapogenin as the aglycone moiety, and a sugar. The sapogenin may be a steroid or a triterpene and the sugar may be glucose, galactose, a pentose, or a methylpentose.Swertia: A plant genus of the family GENTIANACEAE. It is a source of swertiapuniside and IRIDOID GLYCOSIDES.