You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (2R,3R)-2-(2,4-difluorophenyl)-3-[2-(4-methylpyrimidin-5-yl)-3,5,6,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyrazin-4-ium-7-yl]-1-(1H-1,2,4-triazol-2-ium-2-yl)butan-2-ol ?
user
C22H25F2N9O+2
assistant