You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[tert-butyl(dimethyl)silyl]oxy-4-[[(9S,10R,13R,14R,17S)-1-[4-[tert-butyl(dimethyl)silyl]oxy-3-oxobutoxy]-17-ethyl-10,13-dimethyl-2,3,4,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]butan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C41H72O6Si2
assistant