beta-D-Talopyranose, 1,6-O-(5-(2-(2-amino-1,4,5,6,7,8-hexahydro-4-oxo-6-pteridinyl)-3(or 4)-carboxy-4-((1,3-dicarboxypropyl)amino)-2-hydroxy-3-butenyl)-5-hydroxy-1,3-cyclohexanediyl)-2-deoxy-2-((2,4-dihydroxy-1-oxobutyl)amino)-