4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium inner salt

4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium Inner Salt is a useful synthetic intermediate. It is used to prepare fused bicyclic heterocycles as potent and selective 5-HT2A receptor antagonists for the treatment of insomnia. It is also used to synthesize β-?Lactamase Inhibitors.