Maoyuan Biochem is located in Chengdu,Sichuan province.It expertizes in producing camptothecin series products&herbal extract products.Now its main products are: camptothecin, 10-hydroxycamptothecin,7-ethylcamptothecin,7-ethyl-10-hydroxycamptothecin, andrographolide, andrographis paniculata extract,resveratrol,ginko biloba extract ,etc.Maoyuan Biochem is among the TOP 5 manufacturers of camptothecin in China and has established longterm bussiness cooperation with many big pharmaceutical companies in the world market and with its good service,Maoyuan Biochem has become the main supplier of camptothecin with derivatives from China.