(2S,5R)-3,3-Dimethyl-7-oxo-6-[(E)-trifluoromethanesulfonylimino]-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzyl ester

(3S,5R,6R)-benzyl 6-(D-α-benzyloxycarbonylaminophenylacetamido)penicillanate 1-oxide

(1R,5R)-3-D-<(1-benzyloxycarbonylamino-1-phenyl)methyl>-6-<(2-methyl-1-benzyloxycarbonyl)prop-1-enyl>-4-thia-2,6-diazabicyclo<3.2.0>hept-2-en-7-one

(1R,5R)-3-L-<(1-benzyloxycarbonylamino-1-phenyl)methyl>-6-<(2-methyl-1-benzyloxycarbonyl)prop-1-enyl>-4-thia-2,6-diazabicyclo<3.2.0>hept-2-en-7-one