You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,6S,7R,8R,8aS)-6-methoxy-2,2-dioxo-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3,2]dioxathiine-7,8-diol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C7H12O8S
assistant