A six-membered heterocyclic compound consisting of two nitrogen atoms and four carbon atoms in the ring.
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6-(4-bromophenyl)-4-ethoxycarbonyl-(2H)-pyridazin-3-one
2-(4-chlorobenzoyl)-3-methyl-6-morpholino-3-(tertiary butoxycarbonylmethyl)-2,3-dihydro-1,2,4-triazolo<4,3-b>pyridazine
9-hydroxy-9-(3,6-diphenylpyridazin-4-yl)-4-azafluorene
2-Phenyl-5-(3-oxo-2,3,4,5-tetrahydro-6-pyridazinyl)-indole
