Towards deconstruction of the Type D (2,0) theory

We propose a four-dimensional supersymmetric theory that deconstructs, in a particular limit, the six-dimensional (2; 0) theory of type Dk. This 4d theory is de fi ned by a necklace quiver with alternating gauge nodes O(2k) and Sp(k). We test this proposal by comparing the 6d half-BPS index to the Higgs branch Hilbert series of the 4d theory. In the process, we overcome several technical di ffi culties, such as Hilbert series calculations for non-complete intersections, and the choice of O versus SO gauge groups. Consistently, the result matches the Coulomb branch formula for the mirror theory upon reduction to 3d.