[1] Univ Tokyo, Grad Sch Agr & Life Sci, Lab Aquat Nat Prod Chem, Bunkyo Ku, Tokyo 1138657, Japan
[2] Nagoya Univ, Grad Sch Sci, Sugashima Marine Biol Lab, Sugashima Cho, Toba, Mie 5170004, Japan
[3] Univ Sains Malaysia, Ctr Marine & Coastal Studies, Usm 11800, Penang, Malaysia
[4] Univ Tokyo, Grad Sch Agr & Life Sci, Dept Appl Biol Chem, Bukyo Ku, Tokyo 1138657, Japan
[5] Kumamoto Univ, Grad Sch Pharmaceut Sci, Kumamoto 8620973, Japan
[6] Univ Sains Malaysia, Ctr Marine & Coastal Studies, Gelugo, Penang, Malaysia
[7] Res Fdn ITSUU Lab, Takatsu Ku, 3-2-1 Sakado, Kawasaki, Kanagawa 2130012, Japan