Invasion inhibitors of human fibrosarcoma HT 1080 cells from the rhizomes of Zingiber cassumunar: structures of phenylbutanoids, cassumunols - Matsuda, H; Nakamura, S; Iwami, J; Li, X; Pongpiriyadacha, Y; Nakai, M; Kubo, M; Fukuyama, Y; Yoshikawa, M (Chem Pharm Bull, 2011)