You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(diethylamino)ethyl]-4-methyl-N-[2-[(4-methyl-1,3-thiazol-2-yl)amino]-2-oxoethyl]-3-nitrobenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N5O4S
assistant