. "1-Benzyl-4-[(4R,5S,6S)-2-carboxy-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-en-3-ylsulfanylthiocarbonyl]-1-methyl-piperazin-1-ium" . "9v" . . . . . . . . . . . . . . . . . .