You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-methoxyphenyl)-5-[[2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)pyrrolidin-1-yl]methyl]-1,2,4-oxadiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26N6O2
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