Detailed Instructions: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Q: Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the cesium chloride structure.
A:
Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the what?