Patent ID: 8716520

Claim:
A 1:1 co-crystal of (S,S)-3-[(1-phenylethylamino)-methyl]-hexanoic acid with (S)-(−)-1,1′-bi-2-naphthol of the formula (IV) wherein: a) Powder X-ray diffraction peaks at the 2-theta values 9.36, 10.33, 12.17, 15.53, 17.53, 17.87, 17.96, 20.38, 21.76, 22.52, 24.47 and 27.76; b) Differential Scanning calorimetry peak at 185° C.; c) Specific Optical Rotation: (−)15.71° (C=1% in methanol at 25° C., λ=589 nm; d) IR spectra (cm −1 ) 3449, 3059, 2960, 2458, 1620, 1595, 1557, 1504, 1458, 1431, 1397, 1324, 1307, 1275, 1139, 1123, 818, 750 and 709; e) Single crystal X-ray diffraction data Crystal system Orthorhombic Space group P212121 Unit cell dimensions a = 10.1158(18) Å alpha = 90 deg. b = 11.293(2) Å beta = 90 deg. c = 26.118(5) Å gamma = 90 deg Volume 2983.8(9) Å 3 Z 4 Density (calculated) 1.192 g/cm 3 .