Fig. 4From: Cheminformatics-based enumeration and analysis of large libraries of macrolide scaffoldsSixteen structural motifs currently employed in PKS Enumerator. SMs were retrieved from eighteen known bioactive macrolide scaffolds (Fig. 3): nine “common” structural motifs (CSMs) are in blue cells, and seven “rare” structural motifs (RSMs) are in orange cellsBack to article page