Combination of betulinic acid with diazen-1-ium-1,2-diolate nitric oxide moiety donating a novel anticancer candidate. - Zhang, Laiyin; Hou, Shuangxing; Li, Bo; Pan, Jianjian; Jiang, Liping; Zhou, Guiying; Gu, Hong; Zhao, Caixing; Lu, Huiping; Ma, Fenfen (OncoTargets & Therapy, 2018)