You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-(2-chloro-6-fluorophenyl)-N-[(4R)-2,2-diethyl-3,4-dihydrochromen-4-yl]methanesulfonamide .
user
C20H23ClFNO3S
assistant