Structure-activity relationships of polyhydroxyursane-type triterpenoids on the cytoprotective and anti-inflammatory effects. - Jung,H.J.; Nam,J.H.; Lee,K.T.; Lee,Y.S.; Choi,J.W.; Kim,W.B.; Chung,W.Y.; Park,K.K.; Park,H.J. (Nat Prod Sci, 2007)