Fig. 2. Design strategies for A-ring trimethoxy-flavone derivatives containing salicylic acid-modified indole substituents. (A) Chemical structures of compounds 7f and FS-7. (B) The structure of flavonoids, indoles and salicylic acids involved in the splicing principle, as well as the structure of two salicylic acid-modified indole trimethoxy-flavone derivatives containing an A-ring trimethoxy group.
