Bicyclo[3.1.0]hexane-6-carboxylic Acid Ethyl Ester (endo/exo Mixture)

Bicyclo[3.1.0]hexane-6-carboxylic Acid Ethyl Ester (endo/exo Mixture) can be used as an intermediate in the synthesis of various pharmaceutical goods. It is also used in the preparation of BRL 56173, a bicyclic acrylic penicillin highly stable to β-lactamases.