Table 2 Clusterization of the 816 COX-2 inhibitors in preclinical development or in a higher phase, and of the subset of those matching the MDL substructure reported in Fig. 2. Clusters were obtained for each representation type, distinguishing the number of those containing only molecules with exactly 3 or more than 3 rings

From: “Molecular Anatomy”: a new multi-dimensional hierarchical scaffold analysis tool