(2R,3R,4S,5R,6R)-2-[(1S,2S)-1-Amino-2-chloropropyl]-6-(methylsulphanyl)oxane-3,4,5-triol(2R,3R,4S,5R,6R)-2-[(1S,2S)-1-Amino-2-chloropropyl]-6-(methylsulphanyl)oxane-3,4,5-triol