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-[4-[4-[(5-methyl-1,2,4-oxadiazol-3-yl)methoxy]benzoyl]piperazin-1-yl]pyridine-3-carbonitrile .
user
C21H20N6O3
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