You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(Z)-[2-(2,4-dimethylanilino)-2-oxoethylidene]amino]oxy-N-(3-ethylphenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23N3O3
assistant