Patent ID: 7576238

Claim:
A crystalline N,N′-dibenzylethylenediamine salt of a compound of formula (IIa) comprising the following X-ray diffraction peaks: Position [°2θ] d-spacing [Å] Relative Intensity [%] 6.3894 13.8336 17.39 8.0423 10.9938 13.38 12.157 7.2803 19.22 16.012 5.5354 15.74 17.929 4.9475 20.77 18.048 4.9151 14.20 19.038 4.6618 100.00 19.2656 4.6072 26.28 20.325 4.3694 10.65 21.943 4.0508 16.85 22.190 4.0063 18.63 22.330 3.9815 12.37.