You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (E)-3-[5-bromo-1-[(4-chlorophenyl)methyl]indol-3-yl]-2-(1H-indole-3-carbonyl)prop-2-enenitrile ?
user
C27H17BrClN3O
assistant