2',4'-O-Phenylmethylene Di-[O,O'-(Dibenzyl Phosphonate)]-riboflavin is an intermediate in the synthesis of Riboflavin 3',5'-Diphosphate (R415020). Riboflavin 3',5'-Diphosphate forms complexes with apoflavodoxin from Desulfovibrio vulgaris, Anabaena variabilis and Azotobacter vinelandii.