You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-hydroxy-11,11-dimethyl-5-propan-2-yl-16-oxatetracyclo[6.6.2.01,10.02,7]hexadeca-2(7),5-diene-3,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26O4
assistant