Aeide Cyelohexyl-4 Naphtal6ne- l-propionique

C19H2202, F(000) = 304, M r = 282.38, triclinic, Pi, a = 10.918 (4), b = 13.279 (6), c = 6.241 (3)A, a = 97.13 (5), fl = 89.05 (5), y = 60.71 (5) °, Z = 2, O c = 1.202 gcm -3, fl(Cu K0t) = 6.08 cm -1. Full-matrix least-squares refinement of 2612 reflections collected with a Hilger & Watts diffractometer led to R = 0.079. The rotation of the carboxyl group with respect to the benzene ring, which seems to be connected with anti-inflammatory potential, is larger than in the other 2-substituted propionic acids already reported. In the crystal, the molecules are linked into pairs across a centre of symmetry by hydrogen bonding.