1-[[(6R)-2-Carboxylato-7α-[[(R)-[[(5-carboxy-1H-imidazol-4-yl)carbonyl]amino]phenylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]-4-(2-sodiooxysulfonylethyl)pyridinium

1-[[(6R)-2-Carboxylato-7α-[[(R)-[[(5-carboxy-1H-imidazol-4-yl)carbonyl]amino]phenylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]-4-[2-(sodiooxysulfonyl)ethyl]pyridinium

Sodium (6R,7R)-7-[[(2R)-2-[(2-carboxy-3H-imidazole-4-carbonyl)amino]-2-phenylacetyl]amino]-8-oxo-3-[[4-(2-sulfonatoethyl)pyridin-1-ium-1-yl]methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Pyridinium, 1-[[(6R,7R)-2-carboxy-7-[[(2R)-[[(5-carboxy-1H-imidazol-4-yl)carbonyl]amino]phenylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]-4-(2-sulfoethyl)-, inner salt, monosodium salt