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,5R,8R,9S,12R,14R)-8,12-dimethyl-4-methylidene-2,13-dioxatetracyclo[7.5.0.01,5.012,14]tetradecan-3-one .
user
C15H20O3
assistant