You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(17R)-17-[(2R,5R)-5,6-dimethylheptan-2-yl]-10,13-dimethyl-2,5,6,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H48O
assistant