2,6-bis[4-[(3R,5S,8S,14S)-3,7,12-trihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoylamino]hexanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.