Etazolate
Etazolate is an anxiolytic drug which is a pyrazolopyridine derivative and has unique pharmacological properties. It acts as a positive [allosteric modulator] of the GABAA receptor at the barbiturate binding site, as an adenosine antagonist of the adenosine [A1 receptor|A1] and Adenosine [A2 receptor (disambiguation)|A2 subtypes], and as a phosphodiesterase inhibitor selective for the PDE4 isoform. It is currently in clinical trials for the treatment of Alzheimer's disease.