You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethane;(10R,13R)-3,10,13-trimethyl-17-octan-3-yl-2,7,8,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthrene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C30H52
assistant