143818-53-5 4-((4-Carboxyphenyl)oxy)-3,3-diethyl-1-(((phenylmethyl)amino)carbonyl)-2-azetidinone 4-Cdpca Benzoic acid, 4-((3,3-diethyl-4-oxo-1-(((phenylmethyl)amino)carbonyl)-2-azetidinyl)oxy)-, (+-)-