The molecule is a ribose bisphosphate that is the cyclic-1,2-phosphate derivative of 5-phospho-alpha-D-ribose. It is a conjugate acid of a 5-phosphonato-alpha-D-ribose cyclic-1,2-phosphate(3-).
[(3aR,5R,6R,6aR)-2,6-dihydroxy-2-oxo-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3,2]dioxaphosphol-5-yl]methyl dihydrogen phosphate