tetrabenzyl 2-(2,2-dimethyl-1,3-dioxane-4,6-dione)ethylene bisphosphonate

3,3-Bis-(bis-benzyloxy-phosphoryl)-propionic acid (3S,5S,8R,9S,10S,13S,14S)-10,13-dimethyl-17-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester

4,4-Bis-(bis-benzyloxy-phosphoryl)-butyric acid (3S,5S,8R,9S,10S,13S,14S)-10,13-dimethyl-17-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester

3,3-Bis-(bis-benzyloxy-phosphoryl)-propionic acid (8R,9S,13S,14S,17S)-3-benzyloxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester

4,4-Bis-(bis-benzyloxy-phosphoryl)-butyric acid (8R,9S,13S,14S,17S)-3-benzyloxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester