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What is the molecular formula of the compound with this IUPAC name methyl 3-[(8'R,9'S,10'R,13'S,14'S,17'S)-4-ethyl-17'-hydroxy-10',13'-dimethylspiro[1,3-dioxetane-2,3'-2,4,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene]-17'-yl]prop-2-ynoate ?
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C26H36O5
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