You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(15S,19R)-1-bromo-17-(pyridin-3-ylmethyl)-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaene-16,18-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H17BrN2O2
assistant