You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(2,3-difluorophenyl)piperazin-1-yl]-(2-methyl-1H-imidazol-5-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H16F2N4O
assistant