Patent ID: 8377965

Claim:
A crystalline diphosphate salt of biphenyl-2-ylcarbamic acid 1-(2-{[4-(4-carbamoylpiperidin-1-ylmethyl)benzoyl]methylamino}ethyl)piperidin-4-yl ester comprising about 1.8 to about 2.2 molar equivalents of phosphate per molar equivalent of ester and about 6 weight percent of water, and characterized by a powder x-ray diffraction pattern having two or more diffraction peaks at 2θ values selected from 6.4±0.2, 7.6±0.2, 8.6±0.2, 13.7±0.2, 15.0±0.2, 19.4±0.2, 21.6±0.2, 22.1±0.2, 22.9±0.2, and 23.7±0.2.