You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (7R,8R,9S,9aR)-7-(hydroxymethyl)-2,2,4,4-tetraoxo-8,9-dihydro-7H-pyrano[2,3-f][1,3,5,2,4]trioxadithiepine-5a,8,9,9a-tetrol by IUPAC nomenclature, provide its molecular formula.
user
C6H10O13S2
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