Patent ID: 11873279
Assignee: PERFUSE THERAPEUTICS, INC.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. A method of preparing an anhydrous crystalline form of a compound of Formula I:, the method comprising:
(a) stirring the compound of Formula I in an aqueous solution, an organic solvent, or a mixture thereof, at a temperature in the range of about 40° C. to about 120° C.;
(b) cooling the resulting solution to a temperature in the range of about 0° C. to about room temperature; and
(c) filtering the sample to afford the anhydrous crystalline form,

wherein said anhydrous crystalline form has an X-ray powder diffraction pattern comprising at least three characterization peaks, in terms of 2θ, wherein the peaks are selected from 5.6±0.2°, 11.4±0.2°, 17.7±0.2°, 19.3±0.2°, 21.1±0.2°, and 21.9±0.2°.