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 1-[4-[2-(5-bromothiophen-2-yl)acetyl]-1,4-diazepan-1-yl]-2-methylpropan-1-one .
user
C15H21BrN2O2S
assistant