Patent ID: 8729131

Claim:
An agomelatine hydrochloride hydrate of formula I: wherein X is Cl and wherein the agomelatine hydrochloride hydrate is in a crystalline form having the following X-ray powder diffraction diagram expressed in terms of Bragg 2θ angle, interplanar spacing d and relative intensity: 2-Theta d (Å) Relative Intensity (I%) 9.076 9.7360 11.24 13.635 6.4887 27.62 14.427 6.1345 16.38 16.872 5.2507 34.17 18.176 4.8767 100.00 21.610 4.1089 62.25 22.259 3.9905 7.94 22.794 3.8981 19.22 23.878 3.7235 31.32 24.214 3.6726 82.40 25.457 3.4960 41.45 25.714 3.4617 37.06 27.430 3.2488 31.69 29.207 3.0551 13.75 including crystals whose peak diffraction angles match within an error of ±0.2°.