Patent ID: 7230109

Claim:
A crystalline 5-[4-[2-(N-methyl-N-(2-pyridyl)amino)ethoxy]benzyl]thiazolidine-2,4-dione, maleic acid salt, hydrate wherein said hydrate contains water in the range of from 1.5 to 2.5% w/w and provides at least one of: (i) an infra red spectrum containing peaks at 1749, 1703, 1645, 1623, 1365 and 736 cm −1 ; (ii) an X-ray powder diffraction pattern substantially as set out in Table I; (iii) a Raman spectrum containing peaks at 3106, 3069, 3002, 2961, 1750, 1718, 1684, 1385, 1335, 1229, 1078, 917, 428 and 349 cm −1 ; and (iv) a solid-state 13 C nuclear magnetic resonance spectrum containing chemical shifts substantially at 35.7, 37.9, 50.3, 57.0, 65.6, 109.3, 112.9, 112.9, 119.7, 129.1, 133.2, 134.0, 136.1, 136.8, 143.0, 153.2, 157.4, 168.6, 171.7, 173.6, and 176.6 ppm.