In the title heterotrinuclear coordination compound. [CaCu2(C9H4NO5)2(C3H4N2)2(H2O)3]·7H2O. the Ca2+ cation is in a pentagonal–bipyramidal geometry and bridges two (1H-imidazole)[2-(oxaloamino)benzoato(3−)]copper(II) units in its equatorial plane. Each CuII atom has a normal square-planar geometry. https://foldlyers.shop/product-category/sandwich-makers/