You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E)-1-(3-amino-4-methoxyphenyl)-2-[(7-methoxy-1,3-benzodioxol-5-yl)methylidene]-3-methylbutan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23NO5
assistant