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 2-chloro-N-[(3S,4R)-1-[2-(3,5-dimethylphenyl)acetyl]-4-(2,2-dimethylpropyl)pyrrolidin-3-yl]acetamide ?
user
C21H31ClN2O2
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