You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,3S,8S,9S,10R,13S,14S,17R)-17-[(2S)-1-hydroxy-6-methylhept-5-en-2-yl]-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene-2,3-diol by IUPAC nomenclature, provide its molecular formula.
user
C27H44O3
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