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system
Name the molecular formula for the molecule established as 11,17-dihydroxy-10,13-dimethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-17-carboxylic acid using the IUPAC nomenclature.
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C20H28O5
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