Diplopterol is a pentacyclic triterpenoid alcohol, specifically a hopanoid, with the molecular formula C30H52O. It is a natural product commonly found in various plants, bacteria, and some lichens. Its structure is characterized by a hopane skeleton, which is a common feature in many bioactive natural compounds. This compound serves as a biomarker in geochemistry and environmental studies, particularly for tracing bacterial inputs in sediments and petroleum. In biological research, diplopterol and related hopanoids are studied for their role in membrane stability and adaptation in bacteria, especially under stress conditions like high temperature or low pH. It is also investigated for potential biological activities, including antimicrobial and anti-inflammatory properties, though these applications are primarily at the research stage. Diplopterol is primarily used as a standard reference material in analytical chemistry for the identification and quantification of hopanoids in complex biological and environmental samples. Its stability and specific structure make it a valuable tool in biogeochemical research.