You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-2-[[2-[[(8S,9R,10R,13S,14S,17S)-17-hydroxy-10,13,17-trimethyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-3-ylidene]amino]oxyacetyl]amino]-3-phenylpropanoic acid by IUPAC nomenclature, provide its molecular formula.
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C31H40N2O5
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