Compounds can be generated by generators, but also imported from SDF files, CSV files or obtained directly from the ChEMBL database . New import filters can be easily added by extending the Python backend and customizing the components of the React API accordingly (see Python API and JavaScript API). For each compound in the compound set the interface can display its 2D representation (Figure ), molecular identifiers (i.e. SMILES, InChI, and InChIKey), reported and predicted activities (Figure ) and physicochemical properties (i.e. molecular weight, number of heavy atoms, number of aromatic rings, hydrogen bond donors, hydrogen bond acceptors, logP and topological polar surface area).