Patent ID: 8686034

Claim:
A method of treating restless legs syndrome or post herpetic neuralgia in a patient in need of such treatment, comprising administering to the patient a therapeutically effective amount of crystalline 1-{[(Î±-isobutanoyloxyethoxy)carbonyl]aminomethyl}-1-cyclohexane acetic acid, wherein the crystalline 1-{[(Î±-isobutanoyloxyethoxy)carbonyl]aminomethyl}-1-cyclohexane acetic acid has characteristic absorption peaks at 7.0Â°Â±0.3Â°, 8.2Â°Â±0.3Â°, 10.5Â°Â±0.3Â°, 12.8Â°Â±0.3Â°, 14.9Â°Â±0.3Â° and 16.4Â°Â±0.3Â° in an X-ray powder diffractogram using Cu KÎ± radiation.