potassium (2S-cis)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide

(2S,5R)-3,3-Dimethyl-4,4,7-trioxo-4-thia(VI)-1-azabicyclo[3.2.0]heptane-2-carboxylic acid potassium salt