You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-[5-[1-(4-amino-5-methylpyrrolo[2,3-d]pyrimidin-7-yl)ethyl]-3-chloro-2-cyano-6-ethoxyphenyl]azetidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31ClN6O3
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