You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-cyclopropyl-4-(5-methyl-4-oxo-7-pyridin-4-ylthieno[2,3-d]pyridazin-3-yl)benzamide into its molecular formula.
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C22H18N4O2S
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