You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S,9R,10S,13S,14S,17S)-17-[(E,2R,5R)-5,6-dimethylhept-3-en-2-yl]-10,13-dimethyl-1,2,4,5,6,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H44O
assistant