Besides condensed hetero-polycyclic aromatic molecules and metal-organic complexes, we also create fragment assembly-based aromatic molecules by connecting carbon atoms on the rings that belong to different conjugated molecules(Figure ). To achieve this, we mine various conjugated molecules from previous publications using the molecular recognition app, and construct a fragment library by severing the carbon-carbon single bonds between different rings of those molecules. We also mark the bond-breaking atoms of all fragments and connect hydrogen atoms to them for valence saturation. Finally, we construct 9 M fragment assembly-based aromatic molecules by randomly combining molecular fragments through the automated connection of marked carbon atoms.