You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule methyl 2-[3-oxo-1-[3-[3-(4-propan-2-ylphenyl)-1,2,4-oxadiazol-5-yl]propanoyl]piperazin-2-yl]acetate .
user
C21H26N4O5
assistant