You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(7,17-dioxo-13-oxa-4,5,6,11,16-pentazatetracyclo[8.7.0.03,8.012,16]heptadeca-1(10),2,4,8,11-pentaen-6-yl)acetonitrile by IUPAC nomenclature, provide its molecular formula.
user
C13H8N6O3
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