1 5YL 5-(6-D-ribitylamino-2,4(1h,3h)pyrimidinedione-5-yl) pentyl-1-phosphonic acid 1.000 2 INJ 5-(6-D-ribitylamino-2,4-dihydroxypyrimidin-5-yl)-1-pentyl-phosphonic acid 1.000