You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]methyl]-2-(2,3-dimethylphenoxy)-N-methylacetamide into its molecular formula.
user
C20H20ClN3O3
assistant