You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3R)-3-(methylaminomethyl)pyrrolidin-1-yl]-[3-[(6-methylpyridin-3-yl)oxymethyl]phenyl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H25N3O2
assistant