You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1S,2R)-2-aminocyclopentyl]-1-[4-(5-chloropyridin-2-yl)piperazin-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H23ClN4O
assistant