You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,5R)-3-butyl-3-ethyl-7-fluoro-5-(4-fluorophenyl)-1,1-dioxo-4,5-dihydro-2H-1lambda6-benzothiepin-4-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26F2O3S
assistant