Because computational catalyst design hinges on identifying specific ligands to determine reactivity and selectivity it is surprising that there are only a few previously reported ligand library or databases, and they are often specific to a particular type of catalyst. For example, Kulik recently explored ligand additivity relationships in octahedral Fe mononuclear complexes and in doing this developed a ligand library from octahedral complexes in the CSD. After symmetry analysis this ligand library was used to generate ~17,000 octahedral complexes. Kulik has also presented ~5,000 ligands with corresponding charges. During the writing of this manuscript, Corminboeuf reported the program cell2mol that converts crystal structures to individual molecules. Similar to our work, this program has the capability of identifying and detaching ligands from a metal center. Cell2mol was able to successfully interpret about 75% of the CSD entries with a single metal. With a focus on analyzing ligands from only Cr, Mn, Fe, Co, Ni, Cu, Ru, and Re metal centers a ligand database of about 13,000 structures was reported. The ligands generated from cell2mol were not classified and we could not easily use them with our automated catalyst building program.