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 (E)-13-ethyl-17-ethynyl-N-methoxy-17-trimethylsilyloxy-1,2,4,5,6,7,8,9,10,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthren-3-imine into molecular formula.
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C25H41NO2Si
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