You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3S,4S,6R,10R,11R,13R)-4,10,13-trimethyl-17-[(E,2R,5R)-4,5,6-trimethylhept-3-en-2-yl]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthrene-1,3,6,11-tetrol is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H52O4
assistant