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 (3R,8R,9S,10R,13R,14R,17S)-17-(2-chloroethynyl)-10,13-dimethyl-1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthrene-3,17-diol is given. What is its corresponding molecular formula?
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C21H29ClO2
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