You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6,13-ditert-butyl-15,16-dimethyl-2-tricyclo[9.3.1.14,8]hexadeca-1(15),2,4(16),5,7,9,11,13-octaenyl)-pyren-1-ylmethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C43H40O
assistant