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The free ring system, v ‐triazolo[4, 5‐clpyridazine and several derivatives in this ring system such as the adenine analog, 7‐amino‐ v ‐triazolo[4, 5‐clpyridazine, have been prepared. In addition, the fully aromatic pyrazino[2, 3‐clpyridazine ring system has been prepared for the first time.
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Gerhardt et al. (1964) studied this question.
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