Gammacerane is a pentacyclic triterpene compound with the formula C<sub>30</sub>H<sub>52</sub> and five six-membered rings. Its derivatives include tetrahymanolï¼Âgammaceran-3ò-olï¼Âand so on. After millions of years of diagenesis, these derivatives became gammacerane can be used as biomarkers in petroleum to study the origin of petroleum.