[C:1]([C:3]1[C:8]([C:9]#[N:10])=[N:7][CH:6]=[CH:5][N:4]=1)#[N:2].[CH3:11][C:12](=[CH2:14])[CH3:13].S(=O)(=O)(O)[OH:16]>C(O)(C)(C)C>[C:12]([NH:10][C:9]([C:8]1[CH:3]=[N:4][CH:5]=[CH:6][N:7]=1)=[O:16])([CH3:13])([CH3:11])[CH3:14].[C:9]([C:8]1[C:3]([C:1]([NH:2][C:12]([CH3:13])([CH3:11])[CH3:14])=[O:16])=[N:4][CH:5]=[CH:6][N:7]=1)#[N:10]A compound having the formula (4) can be obtained as follows. The corresponding 2, 3-dicyano-pyrazine is reacted with tert-butyl alcohol or isobutylene in the presence of sulfuric acid to obtain the corresponding N-tert-butyl-2-pyrazinecarboxamide and/or 3-cyano-N-tert-butyl-2-pyrazinecarboxamide. Then, thus obtained corresponding N-tert-butyl-2-pyrazinecarboxamide and/or 3-cyano-N-tert-butyl-2-pyrazinecarboxamide are hydrolyzed under an alkaline condition.
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