3-(2-azanylethylsulfanyl)-6-(1-hydroxyethyl)-4-[(4-nitrophenyl)methyl]-7-oxidanylidene-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate hydrochloride; (5R,6S)-4-Nitrobenzyl-3-[(2-aminoethyl)thio]-6-[(1R)-1-hydroxyethyl]-1-azabicyclo[3.2.0]hept-2-ene-7-one-2-carboxylate hydrochloride; 3-(2-aminoethylthio)-6-(1-hydroxyethyl)-4-[(4-nitrophenyl)methyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate hydrochloride
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