Gravar-mail: Poly[[diaquabis(2,2′-bipyridine-κ(2) N,N′)(μ(3)-5-hydroxyisophthalato-κ(5) O (1),O (1′):O (3),O (3′):O (3′))(μ(3)-5-hydroxy­isophthalato-κ(4) O (1),O (1′):O (3):O (3′))(μ(2)-5-hydroxyisophthalato-κ(3) O (1),O (1′):O (3))didysprosium(III)] dihydrate]