You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (1R,2R,3R,6S,7S,8S)-1,8-diphenyl-15-oxahexacyclo[6.6.1.12,7.13,6.02,7.09,14]heptadeca-4,9,11,13-tetraene ?
user
C28H22O
assistant