Patent ID: 6884805

Claim:
A polymorph A crystal of N-(2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-yl)-2-(2-oxopyrrolidine-1-yl)acetamide characterized at least one of the following: (a) a melting point (extrapolated onset) obtained from a differential scanning calorimetry curve lower than 220° C., (b) at least one peak in the X-ray diffraction spectrum at diffraction angle, 2θ, of 8.7°, 9.8°, 11.4°, 13.3°, 15.5°, 16.8°, and/or 17.6° (±0.2°, respectively), (c) the absence of a peak at X-ray diffraction angle, 2θ, of 7.3°, 9.3°, 11.9°, and/or 14.8° (±0.2°, respectively), and/or (d) a water solubility (at 25° C.) of lower than 0.5 mg/mL.