The molecule is a UDP-L-arabinose in which the arabinose has the arabinopyranose form with beta-configuration at the anomeric centre. It is a conjugate acid of an UDP-beta-L-arabinopyranose(2-).
[[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [(2R,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl] hydrogen phosphate