7-hydroxy-4-((4-(p-tolyl)piperazin-1-yl)methyl)chroman-2-one
7-hydroxy-4-((4-(pyridin-2-yl)piperazin-1-yl)methyl)chroman¬ 2-one
7-hydroxy-4-((3-methylpiperidin-1-yl)methyl)chroman-2-one
4-((1, 1-dioxidothiomorpholino)methyl)-7-hydroxychroman-2-one