Not Less Than - 95%
4-[4-(Pyrimidin-2-yl)piperazin-1-yl]butyl [1-[2-oxo-2-[[4-[4-(pyrimidin-2-yl)piperazin-1-yl]
butyl]amino]ethyl]cyclopentyl]acetate; 4-(4-(Pyrimidin-2-yl)piperazin-1-yl)butyl 2-(1-(2-Oxo-2-((4-(4-(pyrimidin-2-yl)piperazin-1-yl)butyl)amino)ethyl)cyclopentyl)acetate; 4-[4-(Pyrimidin-2-yl)piperazin-1-yl]butyl 2-{1-[2-oxo-2-({4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl}amino)ethyl]cyclopentyl}acetate (USP);