Patent ID: 8399511

Claim:
β crystalline form of pinocembrin of formula (I): characterized in that, when analyzed by X-ray powder (polycrystal) diffraction (CuK α radiation), the diffraction peak locations: 2-Theta value)(°) or d value (Å), and the relative strength of diffraction peak: peak height value (Height %) or peak area value (Area %), show the following characteristics: Peak 2-Theta d(Å) Height % Area % 1 7.33 12.06 100.0 66.5 2 9.41 9.40 6.2 4.9 3 11.33 7.81 6.1 4.5 4 14.07 6.29 2.9 2.2 5 14.69 6.03 27.2 17.6 6 17.49 5.07 63.9 100.0 7 19.01 4.67 2.8 1.5 8 21.49 4.13 0.1 0 9 22.11 4.02 12.9 11.2 10 23.17 3.84 19.4 9.5 11 25.91 3.44 3.3 2.5 12 27.41 3.25 31.7 27.4 13 28.31 3.15 19.0 15.1 14 29.51 3.02 1.6 0.3 15 31.03 2.88 0.7 0.4 16 34.47 2.60 1.0 1.5 17 35.45 2.53 0.4 0.2 18 37.24 2.41 1.5 0.7 19 38.15 2.36 1.2 0.9 20 40.61 2.22 3.1 2.8 21 42.83 2.11 1.5 1.4 22 44.89 2.02 1.6 1.3 23 46.01 1.97 2.4 1.8 24 50.36 1.81 0.7 0.8 25 56.63 1.62 1.0 0.9.