You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[2-[2-(2-hydroxyethoxycarbonyloxy)propoxycarbonyloxy]propoxy]propan-2-yl 2-(2-hydroxyethoxycarbonyloxy)propyl carbonate by IUPAC nomenclature, provide its molecular formula.
user
C20H34O15
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