You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (17S)-17-(5-bromofuran-2-yl)-N-(2,4-dimethylphenyl)-15-methyl-13-phenyl-1,8,11,13,14-pentazatetracyclo[8.7.0.02,7.012,16]heptadeca-2,4,6,10,12(16),14-hexaen-9-imine by IUPAC nomenclature, provide its molecular formula.
user
C31H25BrN6O
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