6-Oxo-1,6-dihydropyrazine-2,3-dicarboxamide , its cas register number is 73403-52-8. It also can be called 2,3-pyrazinedicarboxamide, 1,6-dihydro-6-oxo- ; 6-Oxo-1,6-dihydro-pyrazine-2,3-dicarboxylic acid diamide .