Polyoxygenated Steroids from the Octocoral Leptogorgia punicea and in Vitro Evaluation of Their Cytotoxic Activity oleh Maria Izabel G. Moritz, Lucas Lourenço Marostica, Éverson M. Bianco, Maria Tereza R. Almeida, João L. Carraro, Gabriela M. Cabrera, Jorge A. Palermo, Cláudia M. O. Simões, Eloir P. Schenkel