Diterpene quinoids from Tripterygium wilfordii var. regelii which are interleukin-1 inhibitors - Shishido,K.; Nakano,K.; Wariishi,N.; Tateishi,H.; Omodani,T.; Shibuya,M.; Goto,K.; Ono,Y.; Takaishi,Y. (Phytochemistry, 1994)