You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2R,3S,4R)-3-[(4-ethoxycarbonylphenyl)carbamoyl]bicyclo[2.2.1]hept-5-ene-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19NO5
assistant