You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2,4-dichlorophenyl)-5-[4-[(3,5-dimethyl-4-nitropyrazol-1-yl)methyl]phenyl]-1,2,4-oxadiazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H15Cl2N5O3
assistant