You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1H-benzimidazol-2-yl)-3-[5-(trichloromethyl)-1,3,4-oxadiazol-2-yl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H9Cl3N4O2
assistant