Fig. 2From: Design, synthesis and biological activity of hydroxybenzoic acid ester conjugates of phenazine-1-carboxylic acidThe structures of PCA–salicylic acid ester conjugates (5a–5e), PCA-3-hydroxybenzoic acid ester conjugates (5f–5j) and PCA-p-hydroxybenzoic acid ester conjugates (5k–5p)Back to article page