You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-8-(2-methylpropyl)-6-(trifluoromethyl)-1,2,3,4,4a,9b-hexahydropyrido[4,3-b]indole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H23F3N2
assistant