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 3a-(2,3-dihydro-1,4-benzodioxin-6-yl)-1-methyl-4,9b-dihydro-3H-chromeno[4,3-c][1,2]oxazole is given. What is its corresponding molecular formula?
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C19H19NO4
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