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 (6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl)-[6-(prop-2-enylamino)pyridazin-3-yl]methanone is given. What is its corresponding molecular formula?
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C19H22N4O3
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