The X-ray powder diffraction pattern for a bridgehead heterocyclic system was determined. 2- exo -(β-pyridyl)-6- exo -phenyl-7- oxa -1-azabicyclo[2.2.1]heptane, C 16 H 16 N 2 O, is triclinic with refined unit cell parameters a =1.1012(2), b =1.3950(2), c =1.0074(3) nm, α=111.09(2)°, β=104.97(2)°, γ=77.38(2)°, V =1.3813(3) nm 3 , Z =4, and D x =1.212 g/cm 3 with space group P -1 (No. 2).
