[1]ArchivderPharmazie,1990,vol.323,p.323-330
[2]Heterocycles,1996,vol.42,p.415-422
[1]Hirao,Ken-Ichi;Tsuchiya,Ryuta;Yano,Yasuhiro;Tsue,Hirohito[Heterocycles,1996,vol.42,#1,p.415-422]
[2]Dirnberger;Wiegrebe[ArchivderPharmazie,1990,vol.323,#6,p.323-330]