You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (5-amino-3,4-dimethyl-7H-pyrrolo[2,3-c]pyridazin-6-yl)-[3-[4-(difluoromethylsulfonyl)phenyl]-3-fluoroazetidin-1-yl]methanone is given. What is its corresponding molecular formula?
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C19H18F3N5O3S
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