You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-chloro-N-[3-methyl-1-oxo-1-(1-thiophen-3-ylpropan-2-ylamino)butan-2-yl]-4-nitrobenzamide .
user
C19H22ClN3O4S
assistant