2-Pyrazinecarboxamide, N,N-diethyl-5-methyl-, 4-oxide 5-25-04-00200 (Beilstein Handbook Reference) 5-Methylpyrazine-2-carboxylic acid diethylamide 4-oxide 51037-28-6 BRN 0789468 N,N-Diethyl-5-methyl-2-pyrazinecarboxamide 4-oxide