C([O:3][C:4](=[O:16])[C:5]([NH:7][C:8]1[C:13]([C:14]#[N:15])=[CH:12][CH:11]=[CH:10][N:9]=1)=[O:6])C.[OH-].[Na+]>O>[C:14]([C:13]1[C:8]([NH:7][C:5](=[O:6])[C:4]([OH:16])=[O:3])=[N:9][CH:10]=[CH:11][CH:12]=1)#[N:15](3-Cyano-2-pyridyl)oxamic acid ethyl ester (0.005 mole) is stirred in 50 ml. water and 5.0 ml. of N NaOH is slowly added. After one half hour the solution is filtered and the filtrate is acidified to pH 2 with N HCl, giving the title compound.
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