You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (8R,9S,10R,13S,14S,17S)-17-acetyl-4-diazo-10,13-dimethyl-2,5,6,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-one into molecular formula.
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C21H30N2O2
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