Patent ID: 9738639
Date: 2017-08-22
CPC Classifications: A61P,C07D

Claim:
1. A pyrroloquinoline quinine lithium salt crystalline form B, characterized by an X-ray powder diffraction pattern with significant peaks at diffraction angles (2θ values) of about 6.222±0.2°, 7.379±0.2°, 7.941±0.2°, 23.631±0.2°; endothermic peak of the pyrroloquinoline quinine lithium salt crystal is around 90-96° C. in the differential scanning calorimetry thermogram; and the pyrroloquinoline quinine lithium salt crystal shows peaks around 3396.03 cm−1, 1652.70 cm−1, 1604.48 cm−1, 1355.71 cm−1 on infrared spectroscopy (IR) pattern.