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,5R,6R,7R)-7-(3,4-dimethoxyphenyl)-3-hydroxy-6-methyl-5-prop-2-enylbicyclo[3.2.1]oct-3-ene-2,8-dione .
user
C20H22O5
assistant