Lurbinectedin crystal form and method for preparing same

A polymorph of the compound represented by Formula (I), wherein the polymorph is selected from the group consisting of crystal form I, crystal form II, crystal form III, crystal form IV, and crystal form V,

• wherein the crystal form I has characteristic absorption peaks at diffraction angles 2θ of 4.55±0.2°, 6.16±0.2°, 7.61±0.2°, 9.17±0.2°, 9.54±0.2°, and 9.89±0.2° in an X-ray powder diffraction pattern;
• the crystal form II has characteristic absorption peaks at diffraction angles 2θ of 4.56±0.2°, 9.26±0.2°, 9.54±0.2°, 9.93±0.2°, 13.99±0.2°, 18.46±0.2° and 19.02±0.2° in an X-ray powder diffraction pattern;
• the crystal form III has characteristic absorption peaks at diffraction angles 2θ of 4.82±0.2°, 8.75±0.2°, 10.13±0.2°, 10.51±0.2°, 13.23±0.2° and 17.98±0.2° in an X-ray powder diffraction pattern;
• the crystal form IV has characteristic absorption peaks at diffraction angles 2θ of 5.57±0.2°, 7.18±0.2°, 8.70±0.2°, 11.20±0.2°, 11.65±0.2° and 13.63±0.2° in an X-ray powder diffraction pattern;
• and
• the crystal form V has characteristic absorption peaks at diffraction angles 2θ of 6.35±0.2°, 8.01±0.2°, 9.72±0.2°, 14.23±0.2°, 17.04±0.2° and 20.42±0.2° in an X-ray powder diffraction pattern.