The molecule is a organophosphate oxoanion obtained by deprotonation of the phosphate OH groups as well as position N1 of FMNH2. It is a conjugate base of a FMNH2(2-) and a FMNH2.
[(2R,3S,4S)-5-(7,8-dimethyl-2-oxido-4-oxo-3,5-dihydrobenzo[g]pteridin-10-yl)-2,3,4-trihydroxypentyl] phosphate