You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2S)-2-(2,6-dichlorophenyl)-5-(4-phenylphenyl)-2H-1,3,4-oxadiazol-3-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H16Cl2N2O2
assistant