You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S,5S,8R,9S,10S,13R,14S)-3-fluoro-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15-dodecahydro-1H-cyclopenta[a]phenanthrene by IUPAC nomenclature, provide its molecular formula.
user
C19H29F
assistant