Caffeic acid derivatives represent promising lead compounds in the search for tyrosinase inhibitors to be used in the treatment of skin local hyperpigmentation associated to an overproduction or accumulation of melanin. We recently reported the marked inhibitory activity of a conjugate of caffeic
Patrinia heterophylla Bunge, known as "Mu-Tou-Hui" in China, is distributed in most provinces and regions of China. As a traditional medicinal plant, which was first found in <Ben- Cao-Gang- Mu>. In many traditional herbal books, there are records of