You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(6aS,8S)-2-bromo-6,12-dioxo-5,6a,7,8,9,10-hexahydropyrido[2,1-c][1,4]benzodiazepin-8-yl]-3-prop-2-enylurea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H19BrN4O3
assistant