Lactam Triterpenoids from the Bark of Toona sinensis. - Meng, Qian-Qian; Peng, Xing-Rong; Lu, Shuang-Yang; Wan, Luo-Sheng; Wang, Xia; Dong, Jin-Run; Chu, Rui; Zhou, Lin; Li, Xiao-Nian; Qiu, Ming-Hua (Natural Products & Bioprospecting, 2016)