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Under IUPAC nomenclature, a molecule named (2S)-5-(hydroxymethyl)-4-methyl-2-[(1R)-1-[(4R,5R,6R,8R,9R,10S,13R,14R,17S)-4,5,6-trihydroxy-10,13-dimethyl-1-oxo-6,7,8,9,11,12,14,15,16,17-decahydro-4H-cyclopenta[a]phenanthren-17-yl]ethyl]-2,3-dihydropyran-6-one is given. What is its corresponding molecular formula?
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C28H40O7
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