You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (5R,9S,10R,13R,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-1,2,3,4,6,7,9,11,12,15,16,17-dodecahydrocyclopenta[a]phenanthrene-5-carbonitrile ?
user
C28H45N
assistant