You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-[4-[3-(diethylamino)propoxy]-3-methylphenyl]-1-methyltriazolo[4,5-c]pyridine-4-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C21H26N6O
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