PT Journal AU Hussain, H Green, IR Ali, I Khan, IA Ali, Z Al-Sadi, AM Ahmed, I TI Ursolic acid derivatives for pharmaceutical use: a patent review (2012-2016) SO Expert opinion on therapeutic patents PY 2017 BP 1061 EP 1072 VL 27 IS 9 DI 10.1080/13543776.2017.1344219 LA english ER