methyl [2S-[2alpha,5alpha,6alpha,6(S*)]]-6-bromo-6-(1-hydroxyethyl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate
methyl [2S-[2alpha,5alpha,6alpha,6(S*)]]-6-bromo-6-(1-hydroxyethyl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate