diphenylmethyl (2S,5R)-6,6-dibromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide
,5R)-6,6-dibromo-3,3-dimetil-7-oxo-4-tia-1-azabiciclo[3.2.0]eptano-2-carbossilato 4-ossido di difenilmetile