CRYSTAL AND MOLECULAR STRUCTURES OF SELECTED OXIDATIVE NITRATION PRODUCTS OF AMINOPYRAZINE AND 2-AMINO-3-HYDROXYPYRIDINE Article Kovalchukova O.V., Do N.D., Stash A.I., Strashnova S.B., Zaitsev B.E. Crystallography Reports. Vol. 59. 2014. P. 60-65