You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[4-[2-amino-4-(4-aminopiperidin-1-yl)phenyl]phenyl]methyl]-2-sulfanylidene-1,3-thiazolidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4OS2
assistant