(2R,3R,4R,5S,6S)-(+)-6-hydroxy-4-(N-methoxycarbonyl-N-methylamino)-3,5-bis(methoxymethyloxy)-2-methyl-2-(1,4,5,8-tetramethoxy-2-naphthalenyl)tetrahydropyran

(2R,3R,4R,5S,6R)-(+)-2-(5,8-dimethoxy-1,4-dioxo-2-naphthalenyl)-4-dimethylamino-3,5,6-tris(methoxymethyloxy)-2-methyltetrahydropyran