You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-cyclopropyl-N-(3,5-dichloropyridin-4-yl)-8-(difluoromethoxy)-3,4-dihydro-2H-1,4-benzoxazine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15Cl2F2N3O3
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