You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 7-amino-9,12-dimethyl-4-pyridin-2-yl-10-[2-(4-pyrimidin-2-ylpiperazin-1-yl)ethyl]-3,5,6,8,10-pentazatricyclo[7.3.0.02,6]dodeca-2,4,7,11-tetraene-11-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31N11O2
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