You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(5S,6Z,8R,9S,10R,13S,14S)-6-hydroxyimino-10,13-dimethyl-17-oxo-2,3,4,5,7,8,9,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] 3-[methyl(phenylmethoxycarbonyl)amino]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H42N2O6
assistant