Acetic acid (2R,3S,4R,5R,6S)-3-acetoxy-2-acetoxymethyl-5-acetylamino-6-((2S,3S,4S,5R,6R)-4,5-bis-benzyloxy-2-methoxy-6-methoxymethyl-tetrahydro-pyran-3-yloxy)-tetrahydro-pyran-4-yl ester