Three New Cyclopentanoid Monoterpenes from Picrorhiza scrophulariiflora - Wang, Hao; Ye, Wen-Cai; Jiang, Ren-Wang; Wu, Jia-Jun; Mak, Thomas C W; Zhao, Shou-Xun; Yao, Xin-Sheng (Planta Medica, 2004)