IRONWOOD PHARMACEUTICALS, INC.; HUDSON, Colleen; BARDEN, Timothy, C.; JIA, James; MERMERIAN, Ara; PENG, Bo; YANG, Jane; YU, Xiang, Y.; SPROTT, Kevin Patent: WO2012/88469 A1, 2012 ; Location in patent: Page/Page column 151-152 ; WO 2012/088469 A1