Tinospora sinensis (Lour.) Merr., Deciduous vines, to 20 m or longer, puberulent when young, often producing very long aerial roots. Old branches fat and thick, bark brownish, membranous, and often glabrous. Stems slightly fleshy, green when young, striate, pubescent; lenticels raised, (2-)4(-6)-dehiscent. Petiole (4-)6-13 cm, puberulent; leaf blade broadly ovate to subrotund, rarely broadly ovate, 7-14 × 5-13 cm, papery, abaxially tomentulose or slightly tomentulose, adaxially puberulent, base deeply to slightly cordate, margin entire, apex acutely acuminate, palmately 5(-7)-veined at base. It is endemic to China, Cambodia, India, Nepal, Sri Lanka, Thailand, Vietnam. A new dinorclerone diterpenoid glycoside, named 1-deacetyltinosposide A (1), was isolated from the stem of Tinospora sinensis together with 10 known compounds. Their structures were elucidated on the basis of extensive spectroscopic techniques (MS, IR, 1D and 2D NMR experiments).