You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[(1R,8S)-6-(dicyanomethylidene)-10,13-dimethoxy-3-pentacyclo[6.6.6.02,7.09,14.015,20]icosa-2(7),4,9,11,13,15,17,19-octaenylidene]propanedinitrile .
user
C28H16N4O2
assistant