Alkaloids and Saponins as Cytochrome P450 Inhibitors from Blue Cohosh (Caulophyllum thalictroides) in an in vitro Assay - Madgula, Vamsi L. M.; Ali, Zulfiqar; Smillie, Troy; Khan, Ikhlas A.; Walker, Larry A.; Khan, Shabana I. (Planta Medica, 2009)