You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[5-[4-fluoro-3-(2-pyridin-2-ylethoxy)phenyl]-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-7-yl]-3-(trifluoromethyl)pyridine-2-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H19F4N5O2S
assistant