You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,5S,9R,12S,13S,16R,18S)-16-(methoxymethoxy)-13-methyl-7-oxapentacyclo[10.8.0.02,9.05,9.013,18]icosan-8-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H34O4
assistant