You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-bromo-6-(4-but-2-ynoxy-2,6-difluorophenyl)-1-methyl-4,5-dihydro-3H-pyridin-5-id-2-one;yttrium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H13BrF2NO2Y-
assistant