Polycrystalline form of dehydrophenylahistin-like compound, and manufacturing and purification method and application thereof

A crystalline form of (3Z,6Z)-3-benzylidene-6-[(5-tert-butyl-1H-imidazol-4-yl)deuteromethylene]piperazine-2,5-dione as shown in Formula (I), wherein the crystalline form is only one crystalline form selected from the group consisting of α-crystalline form, β-crystalline form, γ-crystalline form and δ-crystalline form, wherein,

• the α-crystalline form has at least three X-ray powder diffraction characteristic peaks at 2θ diffraction angle of 8.415°±0.2°, 11.512°±0.2°, 14.824°±0.2°, 17.087°±0.2°, 17.278°±0.2°, 19.461°±0.2°, 21.350°±0.2°, 22.344°±0.2° or 27.621°±0.2°;
• the β-crystalline form has at least three X-ray powder diffraction characteristic peaks at 2θ diffraction angle of 7.629°±0.2°, 8.052°±0.2°, 12.967°±0.2°, 15.327°±0.2°, 16.195°±0.2°, 23.194°±0.2°, 23.760°±0.2°, 24.129°±0.2°, 24.419°±0.2°, 26.465°±0.2° or 29.213°±0.2°;
• the γ-crystalline form has at least three X-ray powder diffraction characteristic peaks at 2θ diffraction angle of 8.075°±0.2°, 12.986°±0.2°, 16.217°±0.2°, 19.709°±0.2° or 24.441°±0.2°;
• the δ-crystalline form has at least three X-ray powder diffraction characteristic peaks at 2θ diffraction angle of 8.075°±0.2°, 12.988°±0.2°, 16.201°±0.2°, 17.545°±0.2°, 19.084°±0.2°, 19.724°±0.2°, 23.710°±0.2°, 24.422°±0.2°, 26.485°±0.2° or 29.234°±0.2°;