You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (5aR)-5a,5b,8,8,10,11a-hexamethyl-9-oxo-1-propan-2-yl-2,3,4,5,6,7,7a,10,11,11b,12,13,13a,13b-tetradecahydro-1H-cyclopenta[a]chrysene-3a-carbonitrile into its molecular formula.
user
C31H49NO
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