You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S)-1-(1,3-benzodioxol-5-ylmethylamino)-3-methyl-1-oxobutan-2-yl]-3-methylbenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N2O4
assistant