Dhar A, Liu S, Klucik J, Berlin KD, Madler MM, Lu S, Ivey RT, Zacheis D, Brown CW, Nelson EC, Birckbichler PJ, Benbrook DM. Synthesis, structure-activity relationships, and RARgamma-ligand interactions of nitrogen heteroarotinoids. J Med Chem. 1999 Sep 09; 42(18):3602-14.