You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R,5S,8R,9R,10S,13S,14R,17S)-3-chloro-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-3-nitroso-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthrene .
user
C27H46ClNO
assistant