You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R,2S)-2-phenyl-N-[[1-[4-(trifluoromethoxy)phenyl]sulfonylazetidin-3-yl]methyl]cyclopropan-1-amine into its molecular formula.
user
C20H21F3N2O3S
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