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allyl (1R,5R,6S)-2-(3'-pyridyl)-6-<(1R)-1-hydroxyethyl>1-methylcarbapen-2-em-3-carboxylate
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(3S,4R)-1-<<(allyloxy)carbonyl>(triphenylphosphoranylidene)methyl>-3-<(1R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-4-<(1R)-1-(3'-pyridylcarbonyl)ethyl>azetidin-2-one
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(3S,4R)-1-<<(allyloxy)carbonyl>(triphenylphosphoranylidene)methyl>-3-<(1R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-4-<(1R)-2'-<(pyridylthio)carbonyl>ethyl>azetidin-2-one
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allyl (1R,5R,6S)-2-(3'-pyridyl)-6-<(1R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-1-methylcarbapen-2-em-3-carboxylate