You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(2R,3R,4R,5R)-5-[[(4-methoxyphenyl)-diphenylmethoxy]methyl]-4-[(E)-pent-2-enoxy]-3-phenylselanyloxolan-2-yl]pyrimidine-2,4-dione by IUPAC nomenclature, provide its molecular formula.
user
C40H40N2O6Se
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