You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,8R,10S)-3,4-dihydroxy-11,11-dimethyl-5-propan-2-yl-16-oxatetracyclo[6.6.2.01,10.02,7]hexadeca-2,4,6-trien-15-one .
user
C20H26O4
assistant