Which compound has antifluorite structure?

Anti-fluorite structure refers to an anion array with tetrahedral cations and the compound having $A_2 B$ formula have anti-fluorite structure. So, $\mathrm{Na}_2 \mathrm{O}$ has an anti-fluorite structure in which $\mathrm{Na}^{+}$ ions occupy all the tetrahedral voids and $\mathrm{O}^{2-}$ occupy half of the cubic holes.