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Phenolphthalein (Pth) was discovered as a low micromolar inhibitor of the enzyme Thymidylate Synthase (TS), an important target for anticancer chemotherapy. In the present work, a new series of Pth derivatives have been designed and synthesized. All the compounds have been characterized through NMR techniques. A set of twelve Pth derivatives has been tested against three TS enzymes and their bio-profiles obtained. The bio-profiling studies suggest that the inhibitory potency of the compounds has been improved of about fifty times against Lactobacillus casei TS (LcTS) and five times against humant TS (hTS) with respect to the lead. The most active compound shows an inhibition constant (Ki) of 70 nM against Escherichia coli

A step further in the discovery of phthalein derivatives as Thymidylate Synthase inhibitors