Not Less Than - 95%
Buspirone Open Ring Spirodimer Impurity; 4-(7,9-Dioxo-8-azaspiro[4.5]dec-8-yl)butyl [1-[2-oxo-2-[[4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl]amino]ethyl]-cyclopentyl]acetate; 4-(7,9-Dioxo-8-azaspiro[4.5]decan-8-yl)butyl 2-(1-(2-Oxo-2-((4-(4-(pyrimidin-2-yl)piperazin-1-yl)butyl)amino)ethyl)cyclopentyl)acetate