The molecule is a molybdopterin dinucleotide and a Mo-molybdopterin cofactor. It is a conjugate acid of a bis(molybdopterin guanine dinucleotide)molybdenum(4-).
2-amino-8-[[[[(3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl]oxy-hydroxyphosphoryl]oxymethyl]-4-oxo-3,5,5a,8,9a,10-hexahydropyrano[3,2-g]pteridine-6,7-dithiolate;molybdenum(4+)