You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(15S,19S)-1,8-dichloro-16,18-dioxo-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaen-17-yl]-N-[2-(trifluoromethyl)phenyl]hexanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H25Cl2F3N2O3
assistant