((2R,3R,5R)-5-(5-((E)-3-(6-(3',6'-bis(dimethylamino)-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-5-ylcarboxamido)hexanamido)prop-1-enyl)-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3-hydroxytetrahydrofur

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