seco-(8,9)-Buspirone (Butyl-d8) Carboxylic Acid is the isotope labelled analog of seco-(8,9)-Buspirone Carboxylic Acid. seco-(8,9)-Buspirone Carboxylic Acid is a derivative of Buspirone Hydrochloride (B689850). Buspirone Hydrochloride is a non-benzodiazepine anxiolytic; 5-hydroxytryptamine (5-HT1) receptor agonist.