You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3S,4aR,5S,6S,7S,12bS)-4a,5,6,7,8,12b-hexahydroxy-3-methyl-2,3,4,5,6,7-hexahydrobenzo[a]anthracene-1,12-dione into its molecular formula.
user
C19H20O8
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