Antitumor activity of liposomal naphthoquinone esters isolated from Thai medicinal plant: Rhinacanthus nasutus KURZ. - Siripong,P.; Yahuafai,J.; Shimizu,K.; Ichikawa,K.; Yonezawa,S.; Asai,T.; Kanokmedakul,K.; Ruchirawat,S.; Oku,N. (Biol Pharm Bull, 2006)