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 9-acetyl-3-(3,4-dihydroxy-3,5-dimethylhept-1-enyl)-6a-methyl-9,9a-dihydrofuro[2,3-h]isochromene-6,8-dione .
user
C23H28O7
assistant