ethyl 2-{[(2-{[(3R,4R,5S,6R)-5-{[(3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-3,4-dihydroxy-6-(hydroxymethyl)-3,4,5,6-tetrahydro-2H-pyran-2-yl]amino}ethyl)oxy]methyl}-4-(2-chlorophenyl)-5-(methoxycarbonyl)-6-methyl-1,4-dihydropyridine-3-carboxylate dibenzenesulfonic acid