You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[4-ethyl-5-(4-methylphenyl)-1,2,4-triazol-3-yl]sulfanyl]-N-(pyridin-4-ylmethylideneamino)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20N6OS
assistant