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-cyclohexyl-N-[2-[3-(2-methyl-1H-indol-3-yl)-1,2,4-oxadiazol-5-yl]ethyl]ethanamine .
user
C21H28N4O
assistant