The molecule is a D-ribose 1,5-diphosphate(4-) in which the anomeric centre has alpha-configuration. It is a conjugate base of an alpha-D-ribose 1,5-bisphosphate.
[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonatooxymethyl)oxolan-2-yl] phosphate