You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 7-(3-fluorophenyl)sulfonyl-1-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole is given. What is its corresponding molecular formula?
user
C18H14F4N2O2S
assistant