You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(8R,9S,13S,14S,16R,17R)-3-methoxy-13-methyl-16-trimethylsilyloxy-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl]oxy-trimethylsilane is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H42O3Si2
assistant