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-[2-[(5-bromoquinoxalin-6-yl)amino]-4,5-dihydroimidazol-1-yl]-2-[4-[(dihydroxyamino)oxymethyl]phenyl]ethanone .
user
C20H19BrN6O4
assistant