You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,1,1-trifluoro-N-[3-[(7-hydroxy-1,2,3,4-tetrahydronaphthalen-2-yl)methyl]phenyl]methanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18F3NO3S
assistant