3) Linker Number of Rings = 0 this component enforces linkers to possess no rings, i.e., the linker is linear. In the experiment where we want to generate linkers with rings, we simply omit this component in the Scoring Function. learns that linkers containing rings and sp2 hybridized atoms achieve a low ratio of rotatable bonds. Conversely, linear linkers with sp3 hybridized atoms achieve a high ratio of rotatable bonds.