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 (3R,4S,5R,8R,11S,12R,17S,20R)-4,5,8,11,12,16,16,20-octamethyl-24-oxahexacyclo[15.5.2.02,11.03,8.012,21.015,20]tetracos-1-en-23-one .
user
C31H48O2
assistant