References
- Fukuyama , Y , Hasegawa , T , Toda , M , Kodama , M and Okazaki , H . 1992 . Chem. Pharm. Bull , 40 ( 1 ) : 252 – 254 .
- Hasegawa , T , Fukuyama , Y and Asakawa , Y . 1987 . Chem lett , : 329 – 332 .
- Tanaka , H , Kato , I and Ito , K . 1987 . Chem. Pharm. Bull , 35 ( 9 ) : 3603 – 3608 .
- Merlini , L and Zanarotti , A . 1980 . J. Chem. Soc. Perkin I , : 775