通光藤又名乌骨藤、通关藤等,系萝藦科牛奶菜属植物通光散Marsdenia tenacissima(Roxb.)Wight et Arn.的干燥藤茎,主产于云南、贵州等地,具有清热解毒、止咳平喘、消炎镇痛等功效。现代药理学研究表明,通光藤独特的C21甾体衍生物(主要是C21甾体皂苷)具有显著的抗肿瘤活性;通光 Tongguangteng is also known as Wuguteng, Tongguancun, etc. It is a dry cane of the family Dioscorea oleifera, Marsdenia tenacissima (Roxb.) Wight et Arn., which is mainly produced in Yunnan, Guizhou and other places and has detoxification and detoxification. , cough and asthma, anti-inflammatory analgesic effects. Modern pharmacological studies have shown that the unique C21 steroidal derivatives of Tongguangteng (mainly C21 steroidal saponins) have significant anti-tumor activity;