Salts of 2,6-dimethylpyrimidone derivatives and uses thereof

1. A pharmaceutically acceptable acid addition salt of compound (I),

wherein the salt is hydrochloride crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.68±0.2°, 10.88±0.2°, 17.30±0.2°, 22.20±0.2°, and 26.67±0.2°; or

the salt is hydrochloride crystal-II, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.12±0.2°, 8.83±0.2°, 15.56±0.2°, 19.69±0.2°, 25.24±0.2°, and 26.35±0.2°; or

the salt is hydrochloride crystal-III, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.46±0.2°, 10.25±0.2°, 13.62±0.2°, and 17.26±0.2°; or

the salt is sulfate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.35±0.2°, 6.61±0.2°, 16.50±0.2°, and 21.43±0.2°; or

the salt is tosilate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.55±0.2°, 13.74±0.2°, 20.08±0.2°, 21.32±0.2°, 22.17±0.2°, and 22.99±0.2°; or

the salt is maleate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 4.10±0.2°, 16.33±0.2°, and 20.45±0.2°.

2. The acid addition salt of claim 1 , wherein the salt is hydrochloride crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.68±0.2°, 10.88±0.2°, 11.53±0.2°, 12.43±0.2°, 17.30±0.2°, 17.65±0.2°, 19.43±0.2°, 21.83±0.2°, 22.20±0.2°, 22.90±0.2°, 25.51±0.2°, and 26.67±0.2°; or

the salt is hydrochloride crystal-II, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.12±0.2°, 8.83±0.2°, 12.27±0.2°, 13.97±0.2°, 15.56±0.2°, 16.51±0.2°, 17.24±0.2°, 18.48±0.2°, 19.69±0.2°, 22.68±0.2°, 25.24±0.2°, and 26.35±0.2°; or

the salt is hydrochloride crystal-III, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.46±0.2°, 10.25±0.2°, 13.62±0.2°, 17.26±0.2°, 20.56±0.2°, 24.10±0.2°, 26.44±0.2°, 26.66±0.2°, and 27.35±0.2°; or

the salt is sulfate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.35±0.2°, 6.61±0.2°, 13.20±0.2°, 16.50±0.2°, 19.03±0.2°, 21.43±0.2°, and 23.19±0.2°; or

the salt is tosilate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.55±0.2°, 13.74±0.2°, 13.96±0.2°, 17.18±0.2°, 17.44±0.2°, 19.83±0.2°, 20.08±0.2°, 20.31±0.2°, 21.32±0.2°, 22.17±0.2°, 22.99±0.2°, and 26.83±0.2°; or

the salt is maleate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 4.10±0.2°, 8.16±0.2°, 16.33±0.2°, 17.72±0.2°, 20.45±0.2°, 21.58±0.2°, and 24.63±0.2°.

3. The acid addition salt of claim 1 , wherein the salt is hydrochloride crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.68±0.2°, 7.25±0.2°, 10.88±0.2°, 11.53±0.2°, 12.43±0.2°, 12.74±0.2°, 13.63±0.2°, 14.47±0.2°, 14.77±0.2°, 15.23±0.2°, 16.82±0.2°, 17.30±0.2°, 17.65±0.2°, 18.16±0.2°, 19.43±0.2°, 20.19±0.2°, 21.41±0.2°, 21.83±0.2°, 22.20±0.2°, 22.90±0.2°, 23.28±0.2°, 23.79±0.2°, 24.13±0.2°, 24.64±0.2°, 24.99±0.2°, 25.51±0.2°, 25.97±0.2°, 26.67±0.2°, 27.30±0.2°, 27.73±0.2°, 28.86±0.2°, 29.33±0.2°, 29.88±0.2°, 31.02±0.2°, 31.81±0.2°, 32.39±0.2°, 32.83±0.2°, 34.05±0.2°, 34.48±0.2°, 35.69±0.2°, 36.56±0.2°, 37.07±0.2°, and 37.83±0.2°; or

the salt is hydrochloride crystal-II, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.12±0.2°, 8.83±0.2°, 12.27±0.2°, 13.54±0.2°, 13.80±0.2°, 13.97±0.2°, 15.56±0.2°, 16.51±0.2°, 17.24±0.2°, 18.48±0.2°, 19.69±0.2°, 21.81±0.2°, 22.68±0.2°, 23.80±0.2°, 24.70±0.2°, 25.24±0.2°, 25.72±0.2°, 26.35±0.2°, 26.66±0.2°, 27.17±0.2°, 27.50±0.2°, 28.12±0.2°, 29.03±0.2°, 30.43±0.2°, 31.03±0.2°, 31.56±0.2°, and 37.58±0.2°; or

the salt is hydrochloride crystal-III, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.46±0.2°, 6.80±0.2°, 10.25±0.2°, 11.51±0.2°, 11.93±0.2°, 12.77±0.2°, 13.62±0.2°, 14.77±0.2°, 17.26±0.2°, 18.95±0.2°, 19.83±0.2°, 20.56±0.2°, 21.64±0.2°, 22.57±0.2°, 23.09±0.2°, 24.10±0.2°, 26.44±0.2°, 26.66±0.2°, 27.35±0.2°, 28.41±0.2°, 29.09±0.2°, 30.50±0.2°, 31.67±0.2°, 34.16±0.2°, 37.13±0.2°, and 39.38±0.2°; or

the salt is sulfate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 3.35±0.2°, 6.61±0.2°, 7.89±0.2°, 9.90±0.2°, 10.45±0.2°, 12.74±0.2°, 13.20±0.2°, 14.86±0.2°, 15.22±0.2°, 16.50±0.2°, 16.87±0.2°, 17.30±0.2°, 18.40±0.2°, 19.03±0.2°, 19.43±0.2°, 19.65±0.2°, 20.56±0.2°, 20.87±0.2°, 21.43±0.2°, 21.74±0.2°, 23.19±0.2°, 23.45±0.2°, 23.80±0.2°, 24.60±0.2°, 25.29±0.2°, 25.90±0.2°, 26.07±0.2°, 26.40±0.2°, 27.26±0.2°, 28.22±0.2°, 28.47±0.2°, 30.82±0.2°, 31.75±0.2°, 33.80±0.2°, 34.55±0.2°, 36.77±0.2°, 37.30±0.2°, and 39.02±0.2°; or

the salt is tosilate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 6.55±0.2°, 8.18±0.2°, 8.68±0.2°, 9.37±0.2°, 9.60±0.2°, 9.97±0.2°, 10.80±0.2°, 11.05±0.2°, 12.80±0.2°, 13.18±0.2°, 13.74±0.2°, 13.96±0.2°, 15.48±0.2°, 16.41±0.2°, 17.18±0.2°, 17.44±0.2°, 17.87±0.2°, 18.18±0.2°, 18.97±0.2°, 19.83±0.2°, 20.08±0.2°, 20.31±0.2°, 20.95±0.2°, 21.32±0.2°, 22.17±0.2°, 22.47±0.2°, 22.99±0.2°, 23.79±0.2°, 24.02±0.2°, 24.86±0.2°, 25.44±0.2°, 26.27±0.2°, 26.83±0.2°, 27.32±0.2°, 27.65±0.2°, 28.10±0.2°, 29.06±0.2°, 30.39±0.2°, 30.87±0.2°, 31.57±0.2°, 32.04±0.2°, 33.18±0.2°, and 36.87±0.2°; or

the salt is maleate crystal-I, which is characterized by an X-ray powder diffraction pattern comprising peaks expressed as 2θ at 4.10±0.2°, 8.01±0.2°, 8.16±0.2°, 12.23±0.2°, 13.94±0.2°, 14.31±0.2°, 15.32±0.2°, 16.33±0.2°, 16.82±0.2°, 17.72±0.2°, 18.38±0.2°, 18.39±0.2°, 19.14±0.2°, 19.77±0.2°, 20.45±0.2°, 20.95±0.2°, 21.58±0.2°, 22.34±0.2°, 23.87±0.2°, 24.63±0.2°, 25.56±0.2°, 26.43±0.2°, 27.51±0.2°, 28.24±0.2°, 28.78±0.2°, 29.62±0.2°, 30.13±0.2°, 30.93±0.2°, 33.01±0.2°, 35.58±0.2°, and 37.37±0.2°.

4. The acid addition salt of claim 1 , wherein the salt is hydrochloride crystal-I, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 1 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is hydrochloride crystal-II, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 3 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is hydrochloride crystal-III, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 12 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is sulfate crystal-I, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 5 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is tosilate crystal-I, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 7 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is maleate crystal-I, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 10 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°.

5. The acid addition salt of claim 1 , wherein the salt is hydrochloride crystal-I, which is characterized by a Fourier transform infrared spectrogram comprising absorption peaks at 606, 656, 721, 756, 819, 878, 911, 964, 981, 1028, 1078, 1101, 1117, 1153, 1166, 1198, 1215, 1265, 1290, 1343, 1366, 1397, 1435, 1455, 1464, 1512, 1538, 1592, 1616, 1633, 1665, 1694, 1738, 1822, 1957, 2342, 2355, 2555, 2724, 2754, 2857, 2930, 2956, 3024, 3046, 3183, 3256, 3324, 3374, 3419, 3432, 3453, 3459, 3479, 3493 and 3500 cm −1 ; or

the salt is hydrochloride crystal-II, which is characterized by a Fourier transform infrared spectrogram comprising absorption peaks at 667, 727, 757, 882, 969, 1026, 1039, 1081, 1109, 1159, 1199, 1291, 1365, 1396, 1439, 1457, 1478, 1509, 1545, 1593, 1611, 1666, 1729, 2524, 2550, 2581, 2684, 2871, 2934, 2955, 3010, 3257 and 3377 cm −1 .

6. The acid addition salt of claim 1 , wherein the salt is hydrochloride crystal-I, which is characterized by a Fourier transform infrared spectrogram as shown in FIG. 2 , wherein the error margin of the absorption peaks is ±2 cm −1 ; or

the salt is hydrochloride crystal-II, which is characterized by a Fourier transform infrared spectrogram as shown in FIG. 4 , wherein the error margin of the absorption peaks is ±2 cm −1 .

7. The acid addition salt of claim 1 , wherein the salt is sulfate amorphism, which is characterized by an X-ray powder diffraction pattern comprising as shown in FIG. 6 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°; or

the salt is tosilate amorphism, which is characterized by an X-ray powder diffraction pattern as shown in FIG. 9 , wherein the error margin in 2θ of the characteristic peaks is ±0.2°.

8. The acid addition salt of claim 1 , wherein the salt is tosilate crystal-I, which is characterized by a differential scanning calorimetry thermogram comprising an endothermic peak at 231.51° C.±3° C.; or

the salt is maleate crystal-I, which is characterized by a differential scanning calorimetry thermogram comprising an endothermic peak at 116.28° C.±3° C.

9. The acid addition salt of claim 1 , wherein the salt is tosilate crystal-I, which is characterized by a differential scanning calorimetry thermogram as shown in FIG. 8 , wherein the error margin in the endothermic peaks is ±3° C.; or

the salt is maleate crystal-I, which is characterized by a differential scanning calorimetry thermogram as shown in FIG. 11 , wherein the error margin in the endothermic peaks is ±3° C.

10. A pharmaceutical composition comprising the acid addition salt of claim 1 , wherein, optionally, the pharmaceutical composition further comprises a pharmaceutically acceptable carrier, excipient, diluent, adjuvant or a combination thereof.

11. A method of treating or lessening a tissue or organ fibrosis disorder comprising administering to a patient with the acid addition salt of claim 1 .

12. The method of claim 11 , wherein the tissue or organ fibrosis disorder is renal interstitial fibrosis, glomerulosclerosis, liver fibrosis, pulmonary fibrosis, idiopathic pulmonary fibrosis, peritoneal fibrosis, myocardial fibrosis, dermatofibrosis, post-surgery adhesions, benign prostatic hypertrophy, skeletal muscle fibrosis, dermatosclerosis, multiple sclerosis, pancreatic fibrosis, liver cirrhosis, myosarcoma, neurofibroma, pulmonary interstitial fibrosis, diabetic nephropathy, alzheimer disease or vascular fibrosis.

13. A method of treating or lessening a tissue or organ fibrosis disorder comprising administering to a patient with the pharmaceutical composition of claim 10 .

14. The method of claim 13 , wherein the tissue or organ fibrosis disorder is renal interstitial fibrosis, glomerulosclerosis, liver fibrosis, pulmonary fibrosis, idiopathic pulmonary fibrosis, peritoneal fibrosis, myocardial fibrosis, dermatofibrosis, post-surgery adhesions, benign prostatic hypertrophy, skeletal muscle fibrosis, dermatosclerosis, multiple sclerosis, pancreatic fibrosis, liver cirrhosis, myosarcoma, neurofibroma, pulmonary interstitial fibrosis, diabetic nephropathy, alzheimer disease or vascular fibrosis.