A class of β-lactam antibiotics that have a five-membered ring structure and an additional sulfur atom.
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erythro-trans-3-(α-p-nitrobenzyloxycarbonyloxyethyl)-4-(β-hydroxyethylsulfonyl)azetidin-2-one
4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid, 6-[(1R)-1-hydroxyethyl]-7-oxo-, 2-propen-1-yl ester, (5S,6S)-
3-(3-dimethylamino-phenyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester
