You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-1-(4-pyrazol-1-ylphenyl)-4-[4-(2,2,2-trifluoroethoxy)phenyl]pentan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H21F3N2O2
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