(R,S)-2-[4-(benzyloxycarbonyl)phenoxy]-3,3-diethylazetidin-4-one

3.3-Diethyl-4S-(4'-carboxyphenoxy)-2-azetidinone

对羟基苯甲酸

(2R)-2-[(E)-(1,3-Benzodioxol-5-ylmethylene)amino]-2-phenylethanol

1-(4-羟基苯甲酰)-4-甲基哌嗪