(4R,5S)-1-{[(1S,6aS,6R)-5-(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazol-4-ium-6-ylsulfanyl)-1-[(1R)-1-hydroxyethyl]-6-methyl-2-oxo-1,2,6,6a-tetrahydroazeto[1,2-a]pyrrol-4-yl]carbonyl}-5-[(1S,2R)-1-carboxylato-2-hydroxypropyl]-3-(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazol-4-ium-6-ylsulfanyl)-4-methyl-4,5-dihydro-1H-pyrrole-2-carboxylate