You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (9S)-5-N-(cyanomethyl)-8-N-pyridin-2-yl-1,6,8-triazatricyclo[7.2.1.02,7]dodeca-2(7),3-diene-5,8-dicarboxamide .
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C18H19N7O2
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