You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methoxymethyl N-[4-[(1R,4R,5R)-5-amino-2-azabicyclo[2.2.1]heptan-2-yl]-6-fluoro-2-(2-methylpyrimidin-5-yl)oxy-9H-pyrimido[4,5-b]indol-8-yl]-N-methylcarbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H27FN8O4
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