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 5-cyclopentyl-3-[[5-(5-methylpyrazolidin-3-yl)-4-phenylimidazol-1-yl]methyl]-1,2,4-oxadiazole .
user
C21H26N6O
assistant