Diphenylmethane
(6R,7S)-3-Benzoyloxymethyl-8-oxo-7-(2-phenoxy-acetylamino)-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R,7S)-3-(2,2-Difluoro-vinyl)-8-oxo-7-(2-phenoxy-acetylamino)-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R,7S)-8-Oxo-7-(2-phenoxy-acetylamino)-3-((Z)-propenyl)-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R,7S)-8-Oxo-7-(2-phenoxy-acetylamino)-3-prop-1-ynyl-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester