[(3R,4S,5S,6S)-6-[(3S,4R,5S,6R)-5-acetamido-4,6-dihydroxy-2-(sodiooxysulfonyloxymethyl)tetrahydropyran-3-yl]oxy-3,4,5-trihydroxy-tetrahydropyran-2-yl]methoxysulfonyloxysodium