(2S,5R,6R)-3,3,6-Trimethyl-6-[(R)-5-(4-nitro-benzyloxycarbonyl)-5-(4-nitro-benzyloxycarbonylamino)-pentanoylamino]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzyl ester

benzyl 6-β-<(p-nitrobenzyloxycarbonyl)methylsulfonamido>penicillinate sulfone

6-α-methoxymonotriflamide

benzyl (2S,5R,E)-6-((benzo[d]thiazol-2-ylthio)imino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate