You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[4-(2-aminoacetyl)piperazin-1-yl]-5-bromo-1H-pyrrolo[2,3-b]pyridin-3-yl]-2-methyl-3-[(Z)-prop-1-enyl]iminopropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26BrN7O2
assistant