Single crystals of racemic D6H were grown in CH 2 Cl 2 with the diffusion of a vapor of n-pentane. Typically, 5.0 mg of racemic D6H was dissolved in 1 mL of CH 2 Cl 2 , and a vapor of n-pentane was allowed to diffuse into the solution for 3 days. The resulting crystals were washed with n-pentane and then dried.