You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5-cyclopropyl-1-phenyl-1,2,4-triazol-3-yl)sulfanyl]-N-[(1R)-1-phenylethyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N4OS
assistant