You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-(2-methylanilino)-1,3,4-thiadiazol-2-yl]sulfanyl]-1-(4-phenylphenyl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H19N3OS2
assistant