You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (3S,5S,8S,9R,10R,13R,17R)-3,5-dihydroxy-13-methyl-1,2,3,4,6,7,8,9,11,12,16,17-dodecahydrocyclopenta[a]phenanthrene-10,17-dicarboxylic acid is given. What is its corresponding molecular formula?
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C20H28O6
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