You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3E,10S,13S)-3-[(2E)-2-[2-(dimethylamino)ethoxyimino]ethylidene]-10,13-dimethyl-2,4,5,6,7,8,9,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-17-one by IUPAC nomenclature, provide its molecular formula.
user
C25H40N2O2
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