Structures of 1‐[(2S,3S)‐2‐(N,N‐dibenzylamino)‐3‐methyl‐1‐pentyl]pyridinium p‐toluenesulphonate, C25H31N2+.C7H7O3S−, and 1‐[(2S)‐2‐(N,N‐dibenzylamino)‐1‐propyl]pyridinium p‐toluenesulphonate, C22H25N2+.C7H7O3S−