You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-fluoro-2-methylidene-6-propan-2-yl-3-prop-1-en-2-yl-9-propyl-6,7-dihydrobenzo[a]quinolizine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H28FN
assistant