You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(2,4-dimethylphenyl)-2-[[4-ethyl-5-(3-methylphenyl)-1,2,4-triazol-3-yl]sulfanyl]acetamide into its molecular formula.
user
C21H24N4OS
assistant