You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1E,11Z,14S,15S)-2-methoxy-11,15-dimethyl-14-(3-methylbut-2-enyl)-17,18-dioxo-9-oxatricyclo[12.3.1.03,8]octadeca-1,3,5,7,11-pentaen-4-yl]methyl 4-bromobenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H35BrO6
assistant