- (2S,5R)-(Pivaloyloxy)methyl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide,98%, 100mg
- (2S,5R)-(Pivaloyloxy)methyl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide,98%, 500mg