You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[[(3S,8R,9S,10R,13S,14S,17S)-10,13-dimethyl-3-[(2-methylpropan-2-yl)oxy]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]amino]propanoic acid by IUPAC nomenclature, provide its molecular formula.
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C26H43NO3
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