The molecule is a nucleotide-sugar oxoanion obtained by deprotonation of the diphosphate OH groups of GDP-D-mannose; major species at pH 7.3. It is a conjugate base of a GDP-D-mannose.
[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl] [(3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate