4-acetylamino-1-[(6R)-2-carboxy-8-oxo-7t-((R)-2-phenyl-2-sulfo-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-3-ylmethyl]-pyridinium betaine
(6R)-8-oxo-7t-((R)-2-phenyl-2-sulfo-acetylamino)-3-pyridin-4-ylsulfanylmethyl-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R)-8-oxo-7t-((R)-2-phenyl-2-sulfo-acetylamino)-3-pyridin-2-ylsulfanylmethyl-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
1-[(6R)-2-carboxy-8-oxo-7t-((R)-2-phenyl-2-sulfo-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-3-ylmethyl]-pyridinium betaine
cefsulodin