Synonyms: D-Ribitol,1-[4-[[1-(2-amino-1,4,5,6,7,8-hexahydro-7-methyl-4-oxo-6-pteridinyl)ethyl]amino]phenyl]-1-deoxy-5-O-[5-O-[(1,3-dicarboxypropoxy)hydroxyphosphinyl]-a-D-ribofuranosyl]-,[1[R(6S,7S)],5(S)]-; 5,6,7,8-Tetrahydromethanopterin; Tetrahydromethanopterin