You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-N-(3,3-dimethyl-2,4-dihydro-1,4-benzoxazin-6-yl)-5-fluoro-2-N-[3-(1,3-oxazol-2-yl)phenyl]pyrimidine-2,4-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H21FN6O2
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