You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(2S)-2-[(3,5-dimethylpyrazol-1-yl)methyl]pyrrolidin-1-yl]-3-(4-methoxyphenyl)propan-1-one .
user
C20H27N3O2
assistant