Patent ID: 8168679
Filing Date: 2012-05-01
Classification: A61P,C07B,C07C

Abstract:
1. A crystalline form of (R,R)-tramadol-(S)-naproxen salt, characterized in that it shows a X-Ray powder diffraction spectrum with peaks expressed in d-Value in Å at 10.06097, 8.11136, 7.89107, 6.71252, 6.36201, 5.96828, 5.44203, 5.37442, 5.25780, 5.02147, 4.95258, 4.85099, 4.83229, 4.67202, 4.63922, 4.51720, 4.27993, 4.14654, 4.05593, 3.93014, 3.90666, 3.84436, 3.73331, 3.58933, 3.54954, 3.37803, 3.35447, 3.29816, 3.26483, 3.23509, 3.17870, and 3.06515.