You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(diethylazaniumyl)-2-[(E)-[3-(4-fluorophenyl)-5-sulfanylidene-1H-1,2,4-triazol-4-yl]iminomethyl]phenolate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20FN5OS
assistant