For the molecule named ethyl 2-[[(3S,5S,8R,9S,10S,12R,13R,16S,17S)-17-acetyl-3,12-diacetyloxy-10,13-dimethyl-17-trimethylsilyloxy-1,2,3,4,5,6,7,8,9,11,12,16-dodecahydrocyclopenta[a]phenanthren-16-yl]oxy]-2-diethoxyphosphorylacetate by IUPAC nomenclature, provide its molecular formula.