You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(4-methyl-1,2,4-triazol-3-yl)sulfanyl]-N-[4-(N-propan-2-ylanilino)phenyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23N5OS
assistant