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-but-3-enyl-1-[3-(dimethylamino)-2,2-dimethylpropyl]benzimidazol-4-yl]-N-hydroxyprop-2-enamide .
user
C21H30N4O2
assistant