Honzawa, Shinobu; Suhara, Yoshitomo; Nihei, Ken-Ichi; Saito, Nozomi; Kishimoto, Seishi; Fujishima, Toshie; Kurihara, Masaaki; Sugiura, Takayuki; Waku, Keizo; Takayama, Hiroaki; Kittaka, Atsushi Bioorganic and Medicinal Chemistry Letters, 2003, vol. 13, # 20 p. 3503 - 3506 doi: 10.1016/S0960-894X(03)00739-X