You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[(1R,2R)-2-amino-3,3-difluorocyclohexyl]amino]-3-(quinolin-2-ylamino)pyrazine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21F2N7O
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