You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-methyl-2-prop-2-enylidenetricyclo[9.4.0.03,8]pentadeca-1(15),3,5,7,9,11,13-heptaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16
assistant