The molecule is dianion of UDP-D-apiose arising from deprotonation of both OH groups of the diphosphate. It is a conjugate base of an UDP-D-apiose.
[(3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl] [[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl] phosphate