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,5S,8R,9S,10S,13S,14S,17S)-17-(2-aminoethylamino)-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-ol is given. What is its corresponding molecular formula?
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C21H38N2O
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