Inverted retropental hexacosintercepted dishecatonicosachoron

The inverted retropental hexacosintercepted dishecatonicosachoron, or irp xanady, is a nonconvex uniform polychoron that consists of 120 great dodecahedra, 600 truncated tetrahedra, and 120 great ditrigonal dodecicosidodecahedra. Two great dodecahedra, ten truncated tetrahedra, and ten great ditrigonal dodecicosidodecahedra join at each vertex.

Vertex coordinates
The vertices are the same as those of the regiment colonel, the rectified great stellated hecatonicosachoron.