You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-14-propan-2-yltricyclo[9.4.0.03,8]pentadeca-1(11),3(8),4,6,9,12,14-heptaen-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18O
assistant