The molecule is the trianion of molybdopterin obtained by deprotonation of the phosphate and 7-SH groups; major species at pH 7.3. It is a conjugate base of a molybdopterin.
[(5aR,8R,9aR)-2-amino-4-oxo-6-sulfanyl-7-sulfido-3,5,5a,8,9a,10-hexahydropyrano[3,2-g]pteridin-8-yl]methyl phosphate