You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[6-(2-aminophenyl)-5-oxo-4H-1,2,4-triazin-3-yl]sulfanyl]-N-(4-methylphenyl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N5O2S
assistant