You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3R,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] (1R,2R,6R,7R)-5-oxotricyclo[5.2.2.02,6]undeca-3,8-diene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C39H56O3
assistant