You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(3-chlorophenyl)-3-sulfanylidene-1,4-diazaspiro[4.5]dec-1-en-4-yl]-(4-methylphenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21ClN2OS
assistant