You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R,4R,5S,8R,9R)-6,8-dimethyl-4-phenyl-3-oxabicyclo[3.3.1]non-6-en-9-yl]methyl 2-chloroacetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H23ClO3
assistant