2-(1-Piperazinyl)pyriMidine 8,8'-(1,4-Butanediyl)bis-8-azaspiro[4.5]decane-7,9-dione Buspirone EP Impurity M Buspirone impurity 3 Buspirone N-Oxide Buspirone EP Impurity E 3,3-Tetramethyleneglutarimide BUSPIRONE (D8) 8-(pyrimidin-2-yl)-5,8-diazaspiro[4.5]decan-5-ium chloride 8-(4-Chlorobutyl)-8-azaspiro[4.5]decane-7,9-dione 2-(1-Piperazinyl)pyrimidine 2,2'-(1,4-Piperazinediyl)bis-pyrimidine Buspirone EP Impurity C Buspirone Impurity 2 Buspirone EP Impurity H Buspirone Impurity 1 (Lactone of 6-Hydroxy Buspirone) Buspirone EP Impurity F Buspirone EP Impurity I