6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)chroman2-(Chroman-6-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneChroman-6-boronic acid, pinacol ester3,4-Dihydro-2H-chromene-6-boronic acid, pinacol ester3,4-Dihydro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-chromene