the invention provides a method of synthesis of n - 6 - trimethyl - l - lysine derivative compounds for potential treatment of disorders resulting from deficiencies in the tml - carnitine pathway . the invention also provides a method of purification of tml and tml derivative compounds . the treatment of conditions of the diseases late infantile neuronal ceroid lipofuscinosis and neuronal ceroid lipofuscinosis with tml were shown in the original parent application .