1-[5-o-(hydroxy{[hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl)pentofuranosyl]-2,4(1h,3h)-pyrimidinedione

1-[5-o-(hydroxy{[hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl)pentofuranosyl]-2,4(1h,3h)-pyrimidinedione