You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4,4,6,6,7,7,8,11,11b-nonadeuterio-10-methoxy-3-[1,1,2,3,3-pentadeuterio-2-(trideuteriomethyl)butyl]-9-(trideuteriomethoxy)-1,3-dihydrobenzo[a]quinolizin-2-one .
user
C20H29NO3
assistant