trimethylsilyl (R)-3-(acetoxymethyl)-7-(((3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)methyl)imino)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

trimethylsilyl (6R,7R)-3-(acetoxymethyl)-7-((3,5-di-tert-butyl-4-hydroxybenzylidene)amino)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

t-butyl 7α-formamido-7β-<(2,2,2-trichloroethoxy)carbonylamino>cephalosporanate