1) Keto acid 
Celastrol (tripterine) is a chemical compound isolated from the root extracts of Tripterygium wilfordii (Thunder god vine) and Celastrus regelii. Celastrol is a pentacyclic triterpenoid and belongs in the family of quinone methides. In in vitro and in vivo animal experiments, celastrol exhibits antioxidant, anti-inflammatory, anticancer, and insec...