You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2R,4aR,6S,7R,8S,8aR)-7-benzoyloxy-6-methoxy-2-phenyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-8-yl] benzoate by IUPAC nomenclature, provide its molecular formula.
user
C28H26O8
assistant