You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
actinium;(2S,9S,10R)-1,4,12,15-tetrahydroxy-2,9,10,14,17,17-hexamethyl-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-11-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H34AcO6
assistant