Pyridinium,4-[[(2R,4S)-4-[[(4R,5S,6S)-2-carboxy-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-en-3-yl]thio]-2-pyrrolidinyl]methyl]-1-methyl-,chloride (1:1)