You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(Z)-prop-1-enyl]-3-[(2Z,4E)-7,7,7-trifluorohepta-2,4-dien-4-yl]chromen-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H17F3O2
assistant