The molecule is trianion of UDP-alpha-D-galacturonate arising from deprotonation of carboxy and diphosphate groups. It is a conjugate base of an UDP-alpha-D-galacturonic acid.
(2S,3R,4S,5R,6R)-6-[[[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxy-oxidophosphoryl]oxy-3,4,5-trihydroxyoxane-2-carboxylate