Inhibition of Prostaglandin E2 Production by Platycodin D Isolated from the Root of Platycodon grandiflorum - Kim, Yong Pil; Lee, Eun Bang; Kim, Seung Yeun; Li, Dawei; Ban, Hyun Seung; Lim, Soon Sung; Shin, Kuk Hyun; Ohuchi, Kazuo (Planta Medica, 2001)