Britton, Doyle; Noland, Wayland E.; Pinnow, Matthew J.; Young Jr., Victor G.
Helvetica Chimica Acta, 2003 , vol. 86, # 4 p. 1175 - 1192

Ishikawa; Saegusa; Inamura; Sakuma; Ashida
Journal of Medicinal Chemistry, 1985 , vol. 28, # 10 p. 1387 - 1393