((2S,3aS,4R,6S)-4-(hydroxymethyl)-6-(4-oxo-4,5-dihydro-3H-pyrrolo[3,2-d]pyrimidin-7-yl)tetrahydrofuro[3,4-d][1,3]dioxol-2-yl)methylphosphonic acid
((2s,3as,4r,6s)-4-(hydroxymethyl)-6-(4-oxo-4,5-dihydro-3h-pyrrolo[3,2-d]pyrimidin-7-yl)tetrahydrofuro[3,4-d][1,3]dioxol-2-yl)methylphosphonic acid