You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-3-methyl-2-[[4-pyridin-3-yl-6-[2-(trifluoromethyl)anilino]pyrimidin-2-yl]amino]butan-1-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22F3N5O
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