You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[5-(4-ethylphenyl)-1H-1,2,4-triazol-3-yl]sulfanyl]-N-[(4-fluorophenyl)methyl]acetamide into its molecular formula.
user
C19H19FN4OS
assistant