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 (8Z)-14,16-dihydroxy-5,9,12,13,16-pentamethyl-4-oxatricyclo[10.3.1.03,5]hexadeca-1(15),8-dien-2-one .
user
C20H30O4
assistant