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The synthesis and X-ray crystal structure of a new class of fused heterocycle with 8,9-dihydro-pyridazino[1,2,4]triazine type 2 is reported. The synthesis is facile and efficient and, the structure of compounds was proven by elemental and spectral analysis, the X-ray spectra including (for 2b). The compound crystallizes in the space group P21/N (monoclinic) with a = 9.0077(2) �, b = 10.20019(18) �, c = 14.0099(3) �, a= 90�, b = 89.768(2)�, g= 90�, V= 1287.22(5) and Z = 4. Accurate moleculardoi:10.37358/rc.17.6.5633 fatcat:u3vn7kibkrhzbmp76kz2sogk4y