You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (15R)-21-fluoro-10-(3-fluoro-2-methylpyridin-4-yl)-13,17-dioxa-5,7,8-triazapentacyclo[13.6.1.04,12.05,9.018,22]docosa-1(21),4(12),6,8,10,18(22),19-heptaene into molecular formula.
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C23H18F2N4O2
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