You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-(3-chlorophenyl)-4-[(2S)-2-methylbutyl]-2-(2-methylpropyl)-3-oxo-1,4,8-triazaspiro[4.5]decane-8-carbothioamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H35ClN4OS
assistant