You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-fluoro-4'-phenylspiro[2,3,4,9-tetrahydropyrido[3,4-b]indole-1,1'-cyclohexane];N-methylmethanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H30FN3
assistant