LIGAND PHARMACEUTICALS INC.; SMITHKLINE BEECHAM CORPORATION; MCGUINNESS, Brian, F.; HO, Koc-kan; BABU, Suresh; DONG, Guizhen; DUO, Jingqi; LE, Thuy, X., H.; SAIONZ, Kurt, W.; NEEB, Michael, J. Patent: WO2011/2814 A2, 2011 ;