You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[4-(2-chlorophenyl)piperazin-1-yl]-2-oxoethyl]-[(1S)-1-(furan-2-yl)ethyl]azanium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23ClN3O2+
assistant