Great diretrosnub prismatosnub heptishexacosichoron

The great diretrosnub prismatosnub heptishexacosichoron, or gadrosepshix, is a nonconvex uniform polychoron that consists of 600 small stellated dodecahedra, 600 icosahedra, 4800 octahemioctahedra (falling into pairs in the same hyperplanes, forming 2400 compounds of two), 1200 great ditrigonal dodecicosidodecahedra (forming 600 compounds of two), 600 icosidodecadodecahedra, 600 quasirhombicosidodecahedra, 600 truncated great icosahedra, and 3600 pentagonal prisms.

One small stellated dodecahedron, one icosahedron, eight octahemioctahedra (eight compounds), ten great ditrigonal dodecicosidodecahedra (ten compounds), five icosidodecadodecahedra, five quasirhombicosidodecahedra, five truncated great icosahedra, and five pentagonal prisms join at each vertex.

It can be obtained as the blend of 5 great dipentary trishecatonicosihecatonicosihexacosichora and 5 great dipentary prismatodishecatonicosihecatonicosihexacosichora. In the process, some of the octahemioctahedron cells blend out.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the great diretrosnub disnub decahecatonicosadishexacosichoron.