(1S,2S,3R,5S)-3-(7-hydroxy-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol

This compound is a pharmaceutical impurity reference standard, specifically a triazolopyrimidine derivative with a hydroxylated cyclopentyl ring. It is used in quality control and analytical testing to ensure the purity and identity of pharmaceutical products.