Figure 2

Effects of substitution in position 2 of xanthone against AChE and BuChE, respectively. 1, 2, 3, 4 represent hydroxyl, methoxyl, allyloxy, prenylated oxyl substituted in the position 3 of xanthone, respectively. a, b, c, d, e represent diethylamine methyl, dimethylamine methyl, pyrrolidinyl methyl, piperidinyl methyl, morpholino methyl substituted in the position 2 of xanthone, respectively.