You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (5S,6'aS)-3'-nitro-1-propan-2-ylspiro[1,3-diazinane-5,6'-6a,7,8,9,10,11-hexahydro-5H-azepino[1,2-a]quinoline]-2,4,6-trione ?
user
C20H24N4O5
assistant