Biological activity
The inhibitory activities of all the synthesized Mannich bases of 1,3-dihydroxyxanthone derivatives against AChE and BuChE in vitro were tested by slightly modified Ellman method [36], using acetylthiocholine and butyrylthiocholine iodide as substrates and with Galanthamine • HBr as the reference standard. Inhibition potency of the title compounds toward AChE and BuChE was displayed as IC50 values in Table 2.