You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
europium;(Z)-4,4,4-trifluoro-3-hydroxy-1-(4-methylnaphthalen-2-yl)but-2-en-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H11EuF3O2
assistant