Abstract
5-Amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carboxamide was prepared and used as starting material to form the novel 6-chloromethyl-3,4-diphenylpyrimido[4′,5′:4,5]thieno[2,3-c]pyridazin-8(7H)-one (
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