You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 5-[(4-methylcyclopent-2-en-1-yl)methyl]bicyclo[2.2.1]hepta-2,5-diene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H20O2
assistant