You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(10R,13R,17R)-17-[(6R)-7-hydroxy-6-methylheptan-2-yl]-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H44O2
assistant