[(1R,2S,4R)-4-{[2-amino-5-(formylamino)-6-oxo-3,6-dihydropyrimidin-4-yl]amino}-2-hydroxycyclopentyl]methyl dihydrogen phosphate
[(1r,2s,4r)-4-{[2-amino-5-(formylamino)-6-oxo-3,6-dihydropyrimidin-4-yl]amino}-2-hydroxycyclopentyl]methyl dihydrogen phosphate