You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [2-(2,3-dimethylanilino)-2-oxoethyl]-[(2S)-1-(2-methoxy-5-nitroanilino)-1-oxopropan-2-yl]-methylazanium into molecular formula.
user
C21H27N4O5+
assistant