You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(6aS)-6,11-dioxo-6a,7,8,9-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepin-2-yl]-2-(4-bromo-3,5-dimethylpyrazol-1-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20BrN5O3
assistant