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M. Yu. Antipin, T. V. Timofeeva, D. S. Yufit and J. Sauer
Molecular structure and electron density distribution in the crystals of 3,6-dimethoxy-1,2,4,5-tetrazine and 3-phenyl-1,2,4,5-tetrazine based on X-ray diffraction data at 120 and 150 K. “Bent” bonds in the six-membered heterocycle
RUSSIAN CHEMICAL BULLETIN
1995 Volume 44, Number 12, 2337-2345
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http://dx.doi.org/10.1007/BF00713604