(6R,7R)-7-AMINO-8-OXO-3-(PYRIDIN-1-IUM-1-YLMETHYL)-5-THIA-1-AZABICYCLO(4.2.0)OCT-2-ENE-2-CARBOXYLIC ACID
(6r,7r)-7-amino-8-oxo-3-(pyridin-1-ium-1-ylmethyl)-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid