He, Hai-Bing; Gao, Li-Xin; Zhou, Yue-Yang; Liu, Ting; Tang, Jie; Gong, Xue-Ping; Qiu, Wen-Wei; Li, Jing-Ya; Li, Jia; Yang, Fan Heterocycles, 2012 , vol. 85, # 11 p. 2693 - 2712