The molecule is a uridine phosphate in which the uridine bears an additional carboxymethyl substituent at position 5 and the phosphono group is at the 5'-oxygen.
2-[1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-2,4-dioxopyrimidin-5-yl]acetic acid