Pyridinium,4-(aminocarbonyl)-1-[[(6R,7R)-2- carboxy-7-[(carboxyphenylacetyl)amino]-8- oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]- methyl]-,inner salt
Pyridinium,4-(aminocarbonyl)-1-[[(6R,7R)-2- carboxy-7-[(carboxyphenylacetyl)amino]-8- oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]- methyl]-,inner salt