3-Epidehydrotumulosic acid is a triterpenoid compound, specifically a lanostane-type derivative, isolated from the medicinal fungus *Poria cocos* (also known as *Wolfiporia extensa* or Fu Ling). It is structurally related to other bioactive triterpenes like pachymic acid and dehydrotumulosic acid, featuring a carboxylic acid group and a characteristic tetracyclic ring system. This compound is primarily investigated for its pharmacological activities. Research indicates it possesses significant anti-inflammatory and neuroprotective properties. Studies have shown that 3-epidehydrotumulosic acid can inhibit the production of pro-inflammatory mediators (such as nitric oxide and prostaglandin E2) in activated microglial cells, suggesting potential therapeutic applications for neuroinflammatory diseases. It is considered a key active constituent contributing to the traditional medicinal uses of *Poria cocos*. As a natural product lead compound, 3-epidehydrotumulosic acid is of interest in drug discovery for central nervous system disorders and inflammatory conditions. Its isolation, structural characterization, and biological evaluation are central to phytochemical and pharmacological research focused on fungal metabolites.