You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,8S,9R,10R,13S,14R)-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H30O
assistant