Since syndnonimines were synthesized in 1957 (1y2), many derivatives of sydnonimines have been prepared (3'4) and it was found that 3-dialkylaminosydnonimines and their N-acyl derivatives have a remarkable hypotensive activity in animals (5 ' 6 ) .
Yol. 78 solid was filtered, washed with water and dried to give 37.9 g., m.p. 200-211°. After digestion for one hour with 350 ml. of boiling acetone, there was obtained 24.9 g. (66%) of X, m.p. 217-222°.The analytical sample was recrystallized from ethanol and had m.p. 225.5-228.5°, [a]o +110°(1% in dioxane).
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