Trifluoro-acetic acid (1R,7R)-7-methoxymethoxy-1-{(R)-3-methoxymethoxy-3-[(2R,5R)-5-((S)-1-methoxymethoxy-pentadecyl)-tetrahydro-furan-2-yl]-propyl}-8-((S)-5-methyl-2-oxo-2,5-dihydro-furan-3-yl)-octyl ester