Diamond bonded constructions comprise a polycrystalline diamond body having a matrix phase of bonded-together diamond grains and a plurality of interstitial regions between the diamond grains including a catalyst material used to form the diamond body disposed within the interstitial regions. In particular, the present application relates to an improved process for the manufacture of Lacosamide, -2-acetamido-N-benzyl-3-methoxypropion-amide, which is useful as an anticonvulsive drug. Variations described within provide for broadening the bandwidth of the TR isolation and rejection of various noise sources.