Structure-activity relationships of 9-substituted-9-dihydroerythromycin-based motilin agonists: optimizing for potency and safety. - Shaw SJ; Chen Y; Zheng H; Fu H; Burlingame MA; Marquez S; Li Y; Claypool M; Carreras CW; Crumb W; Hardy DJ; Myles DC; et al. (Journal of medicinal chemistry, 2009)