You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[[5-(4-ethoxyphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-[(2-methylphenyl)methyl]acetamide .
user
C20H21N3O3S
assistant