Ticagrelor impurity 15/2,2'-(((3aR,3a'R,4S,4'S,6R,6aS,6'R,6a'S)-((5-nitro-2-(propylthio)pyrimidine-4,6-diyl)bis(azanediyl))bis(2,2-dimethyltetrahydro-4H-cyclopenta[d][1,3]dioxole-6,4-diyl))bis(oxy))bis(ethan-1-ol)

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