You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
11,27-dimethyl-3,15-diphenyl-8,21-bis(2-phenylphenyl)octacyclo[16.10.1.15,9.02,16.04,14.019,24.025,29.013,30]triaconta-1(28),2(16),3,5(30),6,8,10,12,14,17,19(24),20,22,25(29),26-pentadecaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C68H44
assistant