The molecule is a W-molybdopterin cofactor in which the coordinated tungsten species is WO2. It is a conjugate acid of a WO2-molybdopterin cofactor(2-).
(5aR,8R,9aR)-2-amino-4-oxo-8-(phosphonooxymethyl)-3,5,5a,8,9a,10-hexahydropyrano[3,2-g]pteridine-6,7-dithiolate;dioxotungsten