You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-N-(2-chloro-6-methylphenyl)-2-[5-(4-chlorophenyl)-3-oxo-1,2,4-triazin-2-yl]propanamide into its molecular formula.
user
C19H16Cl2N4O2
assistant