You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9R,10R,13R,14S,17S)-2,3,14-trihydroxy-10,13-dimethyl-17-[(2R)-2,3,4,6-tetrahydroxy-6-methylheptan-2-yl]-2,3,4,5,9,11,12,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-6-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H44O8
assistant