Chemical constituents from the stems of Hydrangea paniculata.

Further study on the constituents from the stems of Hydrangea paniculata Sieb resulted in isolation of two new compounds 1-2, including 1 monoterpenoid and 1 phenolic glycoside, along with 10 known compounds. Their structures were elucidated on the basis of spectroscopic data, including UV, IR, MS, and NMR experiments, along with chemical methods. At 10 μM, compounds 1 and 2 exhibited comparable activities with bicyclol in vitro assays for hepatoprotective activity against APAP-induced HepG2 cell damage.