You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(1S)-1-[(3R,8R,9R,10S,13S,17S)-10,13-dimethyl-1-oxo-3-[(2S,3S,4R,5R,6S)-3,4,5-trihydroxy-6-[[(2R,3S,4R,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxy-2,3,4,7,8,9,11,12,16,17-decahydrocyclopenta[a]phenanthren-17-yl]-1-hydroxyethyl]-4,5-dimethyl-2,3-dihydropyran-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C40H58O15
assistant