Atranorin（Cat No.:R035073）is a secondary metabolite commonly found in lichens, particularly in the Parmeliaceae family. It is a depside compound with the molecular formula C19H18O8 and appears as a yellowish crystalline solid. Atranorin exhibits a range of biological activities, including antioxidant, antimicrobial, anti-inflammatory, and cytotoxic effects, making it a subject of interest in pharmaceutical and natural product research. It plays a protective role in lichens against UV radiation and herbivory. Due to its bioactivity, atranorin is studied for potential therapeutic applications, particularly in cancer, infectious disease, and skin care formulations.