Patent ID: 8921324

Claim:
A method for preparing a crystalline salt of a compound of Formula (II) wherein the salt is a citrate salt; and the method comprises (i) preparing a solution of a compound of Formula (II) in an organic solvent; (ii) adding citric acid; (iii) bringing the solution to supersaturation to cause formation of crystals; and (iv) isolating the crystals, wherein said crystalline compound has 2θ values of 4.40; 7.22; 9.12; 12.36; 13.35; 14.34; 15.54; 16.14; 16.54; 17.00; 18.24; 18.58; 19.70; 19.90; 20.30; 20.42; 21.84; 22.02; 23.34; 23.84; 24.04; 24.08; 24.48; 24.76; 25.48; 26.18; 28.14; 28.20; 28.64; 29.64; 31.04; 31.84; 33.00; 33.20; 34.06; 34.30; 34.50; 35.18; 37.48; 37.90; and 39.48.