You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-(2,3-difluoro-4-methylphenyl)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazol-3-yl]-[1,2,4]triazolo[1,5-a]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H15F2N5
assistant