You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-amino-3,3-dimethyl-1-[3-(1-propan-2-ylbenzimidazol-2-yl)piperidin-1-yl]butan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32N4O
assistant