Etiocholanolone-d5 is the deuterium labeled Etiocholanolone. Etiocholanolone (5beta-Androsterone) is the excreted metabolite of testosterone and has anticonvulsant activity[1]. Etiocholanolone is a less potent?neurosteroid positive allosteric modulator?(PAM) of the GABAA?receptor than its?enantiomer form[2].