You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,2S,5S,8R,9S,11S)-8-hydroxy-1-methyl-7-propan-2-yl-10,16-dioxahexacyclo[11.7.0.02,5.02,9.09,11.014,18]icos-14(18)-en-17-one .
user
C22H30O4
assistant