(R)-2-tert-Butoxycarbonylamino-hexanedioic acid 6-benzyl ester 1-(2,2,2-trichloro-ethyl) ester
7α-methoxycephalosporin C
(6R)-3-acetoxymethyl-7t-[(R)-5-tert-butoxycarbonylamino-5-(2,2,2-trichloro-ethoxycarbonyl)-pentanoylamino]-7c-methoxy-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-3-ene-2ξ-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-7t-[(R)-5-tert-butoxycarbonylamino-5-(2,2,2-trichloro-ethoxycarbonyl)-pentanoylamino]-7c-methoxy-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-7t-((R)-5-tert-butoxycarbonylamino-5-carboxy-pentanoylamino)-7c-methoxy-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester