You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-chlorophenyl)-[4-[(3S,4S)-4-hydroxy-1-[4-(trifluoromethyl)pyrimidin-2-yl]pyrrolidin-3-yl]piperazin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21ClF3N5O2
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