You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[[4-[(4-fluoro-2-methyl-4,5-dihydro-1H-indol-5-yl)amino]pyrimidin-2-yl]amino]phenoxy]ethanol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22FN5O2
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