שליחת רשומה: catena-Poly[[{bis­[tetra­aqua­(2-hy­droxy-3,4-dioxocyclo­but-1-en-1-olato-κO (1))bariumstrontium(0.35/0.65)]di-μ-aqua}­bis­(μ-2-hy­droxy-4-oxocyclo­but-1-ene-1,3-diolato-κ(2) O (1):O (3))] monohydrate]