You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-2-(2,4-dichlorophenoxy)-N-[(Z)-(2,4,5-trimethoxyphenyl)methylideneamino]propanamide by IUPAC nomenclature, provide its molecular formula.
user
C19H20Cl2N2O5
assistant