The molecule is trianion of 5,6,7,8-tetrahydromethanopterin arising from deprotonation of carboxy and phosphate OH groups; major species at pH 7.3. It is an organophosphate oxoanion and a dicarboxylic acid dianion. It is a conjugate base of a 5,6,7,8-tetrahydromethanopterin.
(2S)-2-[[(2R,3S,4R,5S)-5-[(2R,3S,4S)-5-[4-[[(1R)-1-[(6S,7S)-2-amino-7-methyl-4-oxo-5,6,7,8-tetrahydro-3H-pteridin-6-yl]ethyl]amino]phenyl]-2,3,4-trihydroxypentoxy]-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxypentanedioate