Not Less Than - 95%
Buspirone Bispyrimidinylpiperazinyl Butane Impurity; 2,2'-[Butane-1,4-diylbis(piperazine-1,4-diyl)]dipyrimidine; 1,4-bis(4-(Pyrimidin-2-yl)piperazin-1-yl)butane