Ohkubo, Mitsuru; Nishimura, Teruyuki; Honma, Teruki; Nishimura, Ikuko; Ito, Satoru; Yoshinari, Tomoko; Suda, Hiroharu Arakawa Hiroyuki; Morishima, Hajime; Nishimura, Susumu Bioorganic and Medicinal Chemistry Letters, 1999, vol. 9, # 23 p. 3307 - 3312 doi: 10.1016/S0960-894X(99)00595-8