You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-[3-(7-diethoxyphosphoryl-1,2,3,4-tetrahydroxy-5-methylheptoxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyethoxy]isoindole-1,3-dione by IUPAC nomenclature, provide its molecular formula.
user
C28H44NO16P
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