Ohta, Shunsaku; Hayakawa, Satoshi; Nishimura, Kazuko; Okamoto, Masao
Chemical and Pharmaceutical Bulletin, 1987 , vol. 35, # 3 p. 1058 - 1069

Hayakawa, Satoshi; Tamai, Yoshimi; Yuasa, Teruyuki; Okamoto, Masao
Heterocycles, 1987 , vol. 26, # 7 p. 1877 - 1882