You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,5-ditert-butyl-3,4-dimethylfuran;2,5-ditert-butyl-3,4-dimethylselenophene;2,5-ditert-butyl-3,4-dimethylthiophene;2,5-ditert-butyl-3-methylfuran;2,5-ditert-butyl-3-methylselenophene;2,5-ditert-butyl-3-methylthiophene by IUPAC nomenclature, provide its molecular formula.
user
C81H138O2S2Se2
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