Mixed-mode stationary phase combining HILIC, reversed-phase, cation-exchange, and anion-exchange interactions. Provides broad selectivity for amino acids, organic and inorganic acids, basic and acidic drugs, counter-ions, environmental contaminants, sugars, and structural isomers. Designed for complex mixtures where multiple interaction mechanisms are required to achieve adequate separation.Single-ligand design with acidic (pKa ~3) and basic (pKa ~10) functional groups separated by a hydrophilic linker. The spatial separation of charge sites enables simultaneous cation- and anion-exchange interactions while minimizing secondary interactions with the silica surface, enhancing selectivity for complex mixtures.Provides ion-pairing functionality on the stationary phase, maintaining full MS compatibility without ion-pairing reagents in the mobile phase.