FIBROGEN, INC.; HO, Wen-Bin; ZHAO, Hongda; DENG, Shaojiang; NG, Danny; WRIGHT, Lee R.; WU, Min; ZHOU, Xiaoti; AREND, Michael P.; FLIPPIN, Lee A. Patent: WO2013/134660 A1, 2013 ; Location in patent: Paragraph 0429 ;