Retention data (n-alkane RI and RT) were acquired for 178 compounds (at least for one of the columns with IL) for three columns with IL-based SP. These compounds include 108 aromatic and 70 aliphatic compounds. Among these molecules, 37 are ethers, 49 are phenols, 13 are aldehydes or ketones, and 129 molecules have a hydroxyl group attached to an aliphatic atom. All considered molecules contain carbon, hydrogen, and oxygen. Some of these compounds contain other elements: