Novel Syntheses of 5-Aminothieno[2,3-c]pyridazine, Pyrimido[4′,5′:4,5]thieno[2,3-c]pyridazine, Pyridazino[4′,3′:4,5]thieno[3,2-d][1,2,3]triazine and Phthalazine Derivatives.

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