You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4aS,8aS)-7-(5-fluoro-4-morpholin-4-ylpyrimidin-2-yl)-1-methyl-3,4,5,6,8,8a-hexahydro-2H-1,7-naphthyridin-4a-yl]methanol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H28FN5O2
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