You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[(3R,5R,6S,10R,13R,17R)-3,6-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H42O4
assistant