You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,4-dichlorophenyl)-2-[[5-[3-(dimethylamino)phenyl]-4-prop-2-enyl-1,2,4-triazol-3-yl]sulfanyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21Cl2N5OS
assistant