You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(4-imidazol-1-ylphenyl)ethyl]-5-pyrrolidin-1-ylsulfonylpyridin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23N5O2S
assistant