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 (8S,9S,10S,13R,14S,17S)-10,13,17-trimethyl-3-oxospiro[8,9,11,12,14,15,16,17-octahydro-7H-cyclopenta[a]phenanthrene-4,1'-cyclopentane]-2-carbonitrile ?
user
C25H33NO
assistant