You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R,2R,5S,6S)-13-propan-2-ylidene-8-oxatetracyclo[4.3.3.12,5.01,6]tridecane-7,9-dione into its molecular formula.
user
C15H18O3
assistant