You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(1S,2S,5R,6S,9S)-5-(hydroxymethyl)-6,8,9-trimethyl-3-oxabicyclo[3.3.1]non-7-en-2-yl]phenol is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24O3
assistant