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 identified by 3,8-dihydroxy-16,17-dimethoxytricyclo[12.3.1.12,6]nonadeca-1(17),2,4,6(19),14(18),15-hexaen-9-one ?
user
C21H24O5
assistant