You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-4-(6-amino-4-chloropyridin-3-yl)-2-(hydroxymethyl)piperazin-1-yl]-[5-(4-fluorophenyl)-4-methoxypyridin-2-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H23ClFN5O3
assistant