| abstract |
The invention relates to the sodium salt of (1R,2S,5R)-7-oxo-6-sulfooxy-1,6- diazabicyclo[3.2.1]octane-2-carboxamide in hydrated or anhydrous crystallized enantiomeric form and in particular in the novel crystallized polymorphic and pseudopolymorphic forms "A", "B", "D" and "E" defined in the application, as well as the method of preparation. The compound of the invention can be used as a medicament, in particular a beta-lactamase inhibitor. |