You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (6-bromo-1,3,4,5-tetrahydropyrido[4,3-b]indol-2-yl)-(5-pyridin-3-yl-1,2-oxazol-3-yl)methanone .
user
C20H15BrN4O2
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