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 3-(2,3-dibromopropyl)-4,7-bis(methylsulfonyl)-3a,5,6,7a-tetrahydro-1H-imidazo[4,5-b]pyrazin-2-one .
user
C10H18Br2N4O5S2
assistant