Novel Synthetic Routes To 1,3,1’,3’-Tetramethyl- Hydurilic Acid and Tetramethylalloxantine (Amalic Acid) and Their Crystal Structures

1,3,1’,3’-Tetramethylhydurilic acid (1) and tetramethylalloxantine (5) were prepared by simple novel methods. The crystal structures of the compounds 1 and 5·2(DMSO) are reported.