(4S,5S)-6-(tert-Butoxy)-5-((tert-butoxycarbonyl)amino)-4-hydroxy-N,N,N-trimethyl-6-oxohexan-1-aminium Chloride is an intermediate for the synthesis of 3S-Hydroxy-N6,N6,N6-trimethyl-L-lysine Chloride (H977645), which is a metabolite in the biosynthesis of carnitine and acts as a biomarker in its analysis. Carnitine is a compound that enables intracellular transport of fatty acids.