N-(3-(2-Amino-7-((2S,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)prop-2-yn-1-yl)-2,2,2-trifluoroacetamide