You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[3-[(4-methyl-1,2,4-triazol-3-yl)methyl]oxetan-3-yl]phenyl]-7-(trifluoromethyl)-5,6,7,7a-tetrahydro-1H-pyrrolo[1,2-c]imidazol-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22F3N5O2
assistant