| 主权项 |
1. A crystalline polymorph of 2-[4-(methylsulfonyl)-2-nitrobenzoyl]-1,3-cyclohexanedione which exhibits at least one of the following properties:
(a) an X-ray powder diffraction pattern having a characteristic peak expressed in 2θ (±0.20°2θ) at 8.0, said peak is characterized by having the highest intensity in the diffraction pattern; (b) an infrared absorption spectrum having at least one characteristic peak with a value expressed as cm-1 (+/−cm-1) selected from the group consisting of 732, 770, 793, 891, 967, 1121, 1152, 1291, 1304, and 2952; (c) 13C solid state NMR having at least one of the following characteristics: (i) 13C solid state NMR chemical shifts, with reference to a value of 176.03 ppm for the carbonyl peak of glycine, having three peaks in the range 191 to 197 ppm (±0.1 ppm); (ii) 13C solid state NMR, expressed as the difference between the smallest value methylene carbon chemical shift peak and the other chemical shift values, having three peaks in the range 171.4 to 177.4 ppm (±0.1 ppm). |
