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