You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3R)-1-[4-chloro-3-(trifluoromethyl)phenyl]-3-[4-(3-methoxyphenyl)piperazin-1-yl]pyrrolidine-2,5-dione ?
user
C22H21ClF3N3O3
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