You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,3,3-trideuterio-2-[2,2,3,3,4,4,5-heptadeuterio-5-(trideuteriomethyl)pyrrolidin-1-yl]-2-methylpropanenitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C9H16N2
assistant