Table 1. Affinity Constants (K_m) of Butyrylcholinesterase for Synthesized N-Acetyl-l-cysteine Fatty Acyl Thioester Derivatives^b.

^aK_m values were determined at 23 °C for compounds 3−8 and 40 °C for compound 9.

^bThere was no hydrolysis of any of these compounds by acetylcholinesterase.