You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[[4-(2,3-dimethylphenyl)piperazin-1-yl]-(ethylamino)methylidene]amino]-N-ethylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H31N5O
assistant