In the title compound. [Sn(C4H9)2(C11H12BrNO4)]. the Schiff base ligand chelates to the SnIV atom through the two deprotonated hydroxy groups. as well as through the N atom. https://countryscenesaddleryandpetsuppliers.shop/product-category/stainless-steel-spur-with-1-band-and-9-point-rowel/