You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-ethyl-6,13-diazapentacyclo[11.7.0.02,6.07,12.014,19]icosa-1(20),7,9,11,14,16,18-heptaene into molecular formula.
user
C20H20N2
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