Ticagrelor Impurity R

(1S,2S,3R,5S) -3- ((6-Chloro-5- ((3- ((1R,2S,3S,4S) -2,3-dihydroxy-4- (2-hydroxyethoxy) cyclopentyl) -5- (propylthio) -3H-[1,2,3]triazolo[4,5-d]pyrimidin-7-yl) amino) -2- (propylthio) pyrimidin-4-yl) amino) -5- (2-hydroxyethoxy) cyclopentane-1,2-diol