15440-46-7 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-6-(((3-fluoro-4-methoxyphenoxy)acetyl)amino)-7-oxo-, monopotassium salt, (2S-(2-alpha,5-alpha,6-beta))- 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(2-(3-fluoro-4-methoxyphenoxy)acetamido)-3,3-dimethyl-7-oxo-, monopotassium salt