1,2,3,4-Butanetetrol, 1,1'-(2,5-pyrazinediyl)bis-, (1R-(1R*,1'R*,2R*,2'R*,3S*,3'S*))- 13121-64-7 2,5-Bis-(D-lyxotetrahydroxybutyl)pyrazine Fructosazine Tagatosazine