(2009/05/29)
(2008/06/13)
(4S)-3,3-diethyl-4-[(4-benzyloxycarbonyl)phenoxy]azetidin-2-one
(R)-2-[4-(benzyloxycarbonyl)phenoxy]-3,3-diethylazetidin-4-one
(4S)-3,3-diethyl-4-{4-[(4-methylpiperazinyl)-carbonyl]phenoxy}azetidin-2-one
3,3-diethyl-4-{4-[(4-methylpiperazin-1-yl)carbonyl]phenoxy}azetidin-2-one
3.3-Diethyl-4S-(4'-carboxyphenoxy)-2-azetidinone