Phosphoric acid, (1S,2R,3R,4Z,6Z,8E)-1-[(3S)-3-[(2S,3S)-3,6-dihydro-3-methyl-6-oxo-2 H-pyran-2-yl]butyl]-3-hydroxy-2-methyl-4,6,8-decatrien-1-yl bis(9H-fluoren-9-ylmethyl) ester