4-NITROBENZYL 6-((R)-1-HYDROXYETHYL)-4-METHYL-3,7-DIOXO-1-AZABICYCLO(3.2.0)HEPTANE-2-CARBOXYLATE, (4R,5R,6S)-
4-nitrobenzyl 6-((r)-1-hydroxyethyl)-4-methyl-3,7-dioxo-1-azabicyclo(3.2.0)heptane-2-carboxylate, (4r,5r,6s)-