You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (1S,2S,5S,8R,9S,10S,11R,18R)-9,10,14,18-tetrahydroxy-12,12-dimethyl-6-methylidene-17-oxapentacyclo[7.6.2.15,8.01,11.02,8]octadec-13-ene-7,15-dione using the IUPAC nomenclature.
user
C20H24O7
assistant